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To treat
Bobtail Ice Cream (2951 N. Broadway) offers one free single scoop of ice cream from 2 to 4 p.m. Saturday.
To audition
The ABC series “SuperNanny” is hosting an open casting call for its fifth season from 11 a.m. to 3 p.m. Sunday at Hollywood Blvd. Cinema (1001 W. 75th St., Woodridge). Visit supernanny.com for information.
To green
Check out the Green Festival at Navy Pier from 10 a.m. to 8 p.m. Saturday and 11 a.m. to 6 p.m. Sunday. Tickets are $15; receive $5 off by bringing three or more books to donate.
