Celebrate your 2026 one-year-old at COSI! Free food, photos, fun, and exclusive museum access. Space is limited, join us!

Is your child turning, or has turned, ONE in 2026? Come celebrate this milestone with us at a private, after-hours party at COSI! Families will enjoy a night full of fun, food, and memories – just for Birthday Bash guests.

What to expect:

FREE, private, after-hours access to COSI – just for Birthday Bash families!
Free food & treats for the whole family
Professional smash cake photos, downloadable on the spot
200 free COSI memberships for families with a child turning one in 2026 (first-come, first-served – registration and attendance required)
Little Kidspace open for little explorers
This celebration is all about your little one’s big milestone.

Space is limited, so register today!