7 p.m., Cancer Prevention Study-3 sign up, Central Community High School, Breese. Held during the Clinton County Relay For Life event. Looking for participants to sign up for a long-term study on the lifestyle, environmental and genetic factors that cause or prevent cancer. www.cancer.org/cps3
6-9 p.m., potluck dinner/dance, Collinsville Senior Citizens Center, 420 E. Main St., Collinsville. $4 admission. 344-7787.
11:30 a.m.-1 p.m., Peanut Butter & Jam Festival, downtown Highland. Free entertainment, PB&J sandwiches, popcorn.
dusk, Movies in the Park, parking lot of Maryville Library, 8 Schiber Court, Maryville. Movie is "Indiana Jones and the Temple of Doom." Bring lawn chairs, blankets, bug spray. www.vil.maryville.il.us.
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9 a.m.-1 p.m., book sale, Tri Township Library, 209 S. Main, Troy. Books, magazines, puzzles, games, tapes. Sponsored by the Friends of the Library.
4:30 p.m.-midnight, St. John the Baptist Church Picnic, church grounds, Smithton. Fish, beer garden, bingo at 6:30 p.m., picnic attractions. Also held August 8.