“I literally did not lift a finger” — Demi C., Huntington Beach“I took a boat to a magical island and met mermaids!” — Sage, via Grandpa Rick“The level of theming and execution of detail rival Disney” — Hana E., Newport Beach“They exceed even Disneyland quality” — Naz E., Los Angeles“Every single mom and kid said it was ‘magical’” — T K., San Francisco“My son is shy and he was having an amazing time” — Erin C., San Francisco“You really feel like you are in an underwater cavern!” — Leslie S., Tustin“Truly magical in every possible way” — Michelle D., Laguna Hills“10/10! Venue, the ladies, set up, ease was all A+!” — Stephanie C., Orange County“Such a dream come true” — Staci R., Rancho Cucamonga“The most special gift of our holiday season” — Chrissy H., Orange“Once Upon An Island is truly exceptional” — Sanaa E., Albuquerque
A magical birthday tea party with a mermaid at Once Upon an Island

Our signature celebration

The birthday she’ll measure
all others against.

A private fantasy world, a professional cast, full transformations, food, tea service and nonstop hosted magic — while you relax in a luxury parents lounge. You don’t lift a finger. You don’t plan a thing. You just get to be there for it.

Choose her fantasy world below.

Completely all-inclusive

You make the wish. We make the magic.

One price, zero jobs for you — it’s like hiring the venue, planner, characters, caterer, décor and cleanup crew all in one. You don’t lift a finger.

EVERY PARTY INCLUDES

Private Venue RentalYour own fantasy world for an exclusive experience.
Character EntertainmentSinging, dancing, storytelling & magical interactive fun.
Dress-Up Wardrobe(most packages)Beautiful costumes & accessories in all sizes.
Salon ExperiencesGlitter, gems & magical makeup for every child.
Tea Party & Lunch ServiceKid-friendly menu served tea party style.
Crafts & ActivitiesMake-and-take-home crafts from our interactive craft stations.
Royal Crowning CeremonyEvery birthday child is crowned in their own royal ceremony.
Parents LoungeA beautiful lounge space with bar-top seating for adults.
Setup & Cleanup IncludedWe handle every detail so you can relax and enjoy the day.

Every party is completely all-inclusive

How does she play?

Start with what she loves — tap a world to open it. The inclusions never change; you’re choosing the characters and the fantasy they bring to life.

Add additional children to any package · $75 per child · Party of 40+? Our Full-Service Travel Parties come to you

Beautifully hosted for parents

Why parents love it.

  • Truly all-inclusive — every detail is handled for you
  • Highly trained, professional character entertainers
  • A magical, immersive experience children never forget
  • Safe, clean & beautifully maintained private venue
  • You relax in the lounge while we create the magic!

Cozy couches, bar-top seating, adult music and upscale ambiance — with optional food & beverage service. Bring your own spread and our team sets up, refills and cleans for you.

10,000+ parties and counting

But don’t take it from us —

Leslie S.Elite 26 Tustin, CA 9369641100
via Yelp
Aug 25, 2024
1 photo

An absolutely incredible experience! Perfect for any child who loves the idea of a mermaid or princess makeover! My daughter is all about mermaids so we knew this would be the perfect venue for her 6th birthday party!

I booked the venue far in advance, which I recommend because this venue fills up, so I was able to snag a date and time that was perfect! It was super easy to book. …

We paid extra to upgrade one of the mermaids to a princess of my daughter's choice (she chose Ariel) and it was absolutely worth every penny to upgrade. I was pleasantly surprised to see Ariel was present for the entire duration of the party. She was partially in a mermaid style dress and then transformed into her mermaid form! It was absolutely magical!

The sand craft was super cute and the girls had so much fun having Ariel help make their sand creations! I loved the organization where some girls would be getting makeovers and some would be doing the craft. The other mermaids doing the make-overs were incredible! They were super friendly to all the girls and talked and entertained them the entire time they were doing the make-overs.

The venue has been remodeled since we had been there a year ago and it was absolutely gorgeous. You really feel like you are in an underwater cavern! I loved how the little forest doubled as a closet for the mermaid tails and a little hideaway for the kids!

I highly recommend this venue!!

Stephanie C.Elite 26 Orange County, CA 15277838
via Yelp
Oct 28, 2024
3 photos

Wow! What a truly wonderful experience both the kids and adults had! It was by no means inexpensive, buuuut in all fairness they do all the work for you and they do it extremely well! The princesses were A+ in the look and character, professional, friendly, great energy, and hard working! We chose the Ultimate Royal Sea Party with 4 princesses and all 4 of them spent the entire time with the kids doing various activities. It was maximum princess engagement for all the kids! We also selected the full service adult lounge which was really nice. It allows you to bring outside food, but they set up, refill, and clean for you! I was so impressed that they had a cute glass display for the tiny desserts I brought too. I didn't expect for them to arrange all the drinks nicely in ice also. This is a case of you really get what you pay for. 10/10! Venue, the ladies, set up, ease was all A+!

Michelle D. Laguna Hills, CA 227106103
via Yelp
May 7, 2025
4 photos

We hosted our daughter's 5th and 6th Birthday at this location and to say we love this place is an understatement! It's truly magical in every possible way. Not one detail was overlooked, everything is prepared for you (based on the package you select) and the amazing staff takes care of all the logistics. We are raving fans and hope that OUAI continues to thrive. Thank you to the fabulous staff, and talented Princesses for making unforgettable moments for our girl and our guests! We'll be back and we'll send friends!

Katrina K. Foothill Ranch, CA 1281312
via Yelp
Dec 30, 2024
5 photos

My daughter just had her 6th birthday here and she had the BEST time! Everything from the start was amazing and organized and they really do the best job at making the parents not lift a finger. The kids were so happy and entertained the whole time. The mermaids and Ariel were fantastic. Would highly recommend using this company for anyone whose daughter loves mermaids or princesses.

Join the Birthday Club.

Birthdays sneak up on everyone but us. Tell us your little one’s big day and we’ll write to you before it arrives — with first pick of party dates, Birthday Club treats and a little magic meant just for her.

We use your details only for Birthday Club magic and party news. Never sold, never shared, unsubscribe anytime.

Good questions, honest answers

Party FAQs.

Do I need to know my final guest count before booking?

No! You don’t even need to know exactly which package you’d like yet. The most important thing is securing your preferred date on the calendar. Our team will happily guide you through package selection, guest count adjustments, upgrades and final details as your celebration gets closer.

What food is included?

Kids actually EAT at our parties — moms, rejoice! Every party includes cheese pizza, Pirate’s Booty popcorn, tropical fruit snacks and our signature pink sparkling tea service, all beautifully served by our attentive staff during the party.

While we don’t include cake or desserts, our team is happy to cut and serve your cake to guests during the celebration.

How many kids can come, and can I add extra children?

1.5-hour parties include 5 children (up to 6 total). 2-hour parties include 10 children (up to 12 total). 2.5-hour parties include 14 children (up to 18 total — sometimes 20 if guests are dropped off). Additional children are $75 each.

Larger group? Our Full-Service Travel Parties come to you — we can recommend venues, beaches and parks, and accommodate 40+ children.

What’s the difference between the party packages?

Every party is completely all-inclusive: full salon makeovers, dress-up transformations, immersive entertainment, food & tea party service, magical activities, private venue time, setup, cleanup and nonstop hosted fun.

The biggest difference is the CHARACTERS — they shape the vibe, energy and style of the whole celebration. A Signature Mermaid Party for a 3-year-old feels whimsical and sweet; the same party for a 10-year-old feels energetic, playful and “cool.” You’re essentially choosing the fantasy world that fits your child best.

What do parents do during the party?

Parents actually get to relax and enjoy the celebration. While children are immersed in magical activities with our staff, adults unwind in our luxury parents lounge with cozy couches, bar-top seating, adult music, upscale ambiance and optional food & beverage service.

Can siblings or parents participate?

Our parties are designed for the children in your guest count. Siblings are welcome to observe, or can be added as official guests for full participation (makeover, lunch and all) at the additional child rate.

What if I need to reschedule or cancel?

We try to be as flexible as we can — we know things happen with kids! Because our venue is so in-demand, deposits are non-refundable, but usually transferable to another date or service.

Is the deposit refundable or transferable?

Deposits are non-refundable, but in many cases may be transferred to a future date if rescheduled within our policy window. Full reschedule and cancellation terms are provided at checkout.

Dates fill fast

Save her date first. Decide the rest later.

Dates fill fast — book early!

✦ Check Your Party Date