Check out materials from Lawrence Public Library by 6 p.m. today; migration of data to a new computer system begins Monday.

Defend Lawrence! 5K, assemble 4:45 a.m., run at 5:05 a.m., Ad Astra Running, 734 Massachusetts St. Free event; mimosas to follow.

VFW Breakfast Buffet, 9 a.m.-1 p.m., 1801 Massachusetts St. Proceeds benefit veterans organizations.

Huge KU Reuse Treasure Sale — All Clothes $1, 10 a.m.-4 p.m., 1041 New Hampshire St., south entrance.

Mission Fest, 11 a.m., St. John’s United Church of Christ, 396 East 900 Road, Baldwin City. Potluck lunch to follow.

Kansas Weddings Magazine Annual Event, 12-4 p.m., Abe & Jake’s Landing, 8 E. Sixth St. Free admission; RSVP and register to win free gifts: kansasweddingsmagazine.com/registration

An Open Afternoon of Sound Healing, 1-3 p.m., Lavender House, 1600 New Hampshire St.

Sunday Afternoon Free Program on nature topics, 1:30-2 p.m., Prairie Park Nature Center, 2730 Harper St. Children under age 14 must be accompanied.

Mysterious Mustache Book Club (ages 8-12), 1:30-2:30 p.m., Readers’ Theater, Lawrence Public Library, 707 Vermont St.

Bead Weaving Group, 2-5 p.m., Lawrence Public Library Room B, 707 Vermont St.

Blue 88, 2-6 p.m., Slow Ride Roadhouse, 1350 N. Third St.

Irish Traditional Music Session, 5:30-9 p.m., upstairs Henry’s on Eighth, 11 E. Eighth St.