Free Kids' Workshop at Home Depot.
My kids have thoroughly enjoyed these workshops. We just started going this year and so far my daughter made a rain gauge (which she painted pink and purple, of course), my son made a car display and they've each made a perpetual calendar. This is a whole lotta free family fun!
Our local store does not require pre-registration, but some stores do, so as always, check with your store to be sure they're participating.