First Birthday Bash

Register today! The 2026 First Birthday Bash will be on Saturday, October 17th.

Click here to sign up for the Birthday Bash!

Group of children and adults gathered around and touching a fog or mist on the floor in an indoor setting, engaging with the mysterious material.

CelebrateOne’s First Birthday Bash at COSI is an after-hours private celebration bursting with first-birthday magic, joyful giggles, and frosting-covered smiles. For one magical night each year, the entire museum transforms into a world of wonder for families whose babies are turning one - a moment that captures the joy of parenthood and the heart of CelebrateOne’s mission to help every baby in Columbus reach this milestone.

Two children in colorful costumes celebrating a birthday, one dressed as a superhero and the other as Stitch from Lilo & Stitch, sitting in a white high chair decorated with a green number 1, with a backdrop of gold and white balloons.

A toddler wearing a white beanie, navy blue shirt with 'One' written on it, light gray pants, and brown shoes, walking on a carpeted floor. A smiling woman is kneeling behind the toddler, dressed in a white fuzzy sweater with pink accents and dark pants. There are others in the background and the setting appears to be indoors.

Families spend the evening exploring COSI’s hands-on exhibits through the eyes of their little ones - wide with wonder, reaching for bubbles, lights, and colors that dance around them. Giggles echo through the museum as parents capture frosting-covered smiles during professional smash-cake photos and watch their babies discover the world in new ways. Sweet treats, playful activities, and the joyful energy of first-time explorers fill every corner of the museum.

And thanks to CelebrateOne’s partnership with COSI, the first 200 families receive a free one-year COSI Family Membership, extending the joy and learning far beyond this magical night.

Children and adults playing a water ring toss game with floating colorful balls at an indoor location with brown walls.

Past First Birthdays

2025 Photos & Video

2024 Photos