Park District tot open-gym
The buried winter MVP — fieldhouse "Moms, Pops & Tots" and tot open-play, citywide and cheap.
Why you'll go
Per-park toddler open-gym + parent-tot classes in fieldhouses all over the city — room to run, toys, crafts. No listings site surfaces it; one parent quoted ~$20 for 11 Saturday mornings.
Real talk
Not a drop-in product — seasonal registration via ActiveNet, split by a California Ave line (west parks open day 1, east day 2). Find sessions via Park Finder or mychimyfuture.org. Example fieldhouses: Bell Park, Chippewa.