Antique Automobile Club of Lawrence swap meet, 6 a.m. to noon, Douglas County 4-H Fairgrounds, 21st and Harper streets, $3 to park, 843-2222.
To The River and Back, 5K/10K run and family fun mile, 8 a.m., a benefit for the Lawrence Community Nursery School, 645 Ala., www.totheriverandback.org.
Spring Parade of Homes, noon-5 p.m., by the Lawrence Home Builders Association, www.lhba.net.
"Colors," a Kansas University music theater production for the Douglas County AIDS Project, 1 p.m. and 3 p.m., Murphy Hall, Inge Theatre, 864-3982.
Kaw Valley Shape Note Sing, 1:30 p.m.-3:30 p.m., Unitarian Fellowship of Lawrence, 1263 N. 1100 Road, 749-1356.
Hyperflight SkyHoundz Canine Disc championship, 2 p.m., South Park, 1200 Mass., free entries, www.skyhoundz.com, 832-7940.
Lecture: U.S. Rep. Dennis Moore, on community and college student issues, by the KU Young Democrats, 3 p.m.-5 p.m., Ecumenical Christian Ministries, 1204 Oread Ave., $10 or $5 for students.
Student Chamber Ensemble, Chamber Choir and Concert Choir, 7:30 p.m., First Presbyterian Church, 2415 Clinton Parkway, 864-3436.
Cottonwood Classies gala, 6:30 p.m.-8:30 p.m., KU's Crafton-Preyer Theatre, 842-0550.
"Home-Makers" supportive housing presentation and discussion, 7 p.m., Trinity Lutheran Church, 1245 N.H.
South Junior High School band feeder concert, 7 p.m., 2734 La.
Lecompton City Council meeting, 7 p.m., Lecompton City Hall, 327 Elmore St.
InterFaith Initiative, 1 p.m.-2:30 p.m., Victory Bible Church, 1942 Mass.
Coalition on Homeless Concerns, 3 p.m.-5 p.m., Lawrence Public Library, 707 Vt.
Downtown Farmers Market, 4 p.m.-6 p.m., 1020 Vt.
Lawrence City Commission meeting, 6:35 p.m., City Hall, Sixth and Massachusetts streets.
South Junior High School 8/9 band concert, 7 p.m., 2734 La.
Brook Creek Neighborhood Association meeting, 7 p.m., East Lawrence Recreation Center, 1245 E. 15th St.
"The Kingdom of Saudi Arabia: Its People and Its Values," by Teresa McCown, K.C.-area author of "Shifting Sands: Life in Arabia with a Saudi Princess," 7 p.m., Lawrence Public Library auditorium, 707 Vt.