Grassy Knees

Grassy Knees lists real things to do with kids — library programs, museum family days, festivals, nature walks — across 32 US metro areas. Every listing links to the organizer’s own page and shows the date we last checked it. Free to browse without an account, with a weekly weekend email and an iPhone app. Each city has a this-weekend page and seasonal guides (Halloween, holidays, free events). You can filter by age, day, price and category, or browse on a map. Built by a dad.