All events are free unless otherwise noted.

Today

Garden Planning and Crop Rotation — Joel D. Valdez Main Library, 101 N. Stone Ave. Discussion on the two primary crop-rotation techniques and how to apply them in a garden. Bring a lunch. Noon-1 p.m. June 21. 791-4010.

Saturday

Saguaro Romance Writers: Special Event — Viscount Hotel, 4855 E. Broadway. “Perfecting The Pitch” and “Letting Mad Men Write Your Synopsis” presented by Laurie Schnebly Campbell. Lunch included. 9:30 a.m.-3 p.m. June 25. $45. 745-6500.

Wednesday

A Sticky Situation at Saguaro — Saguaro National Park East, 3693 S. Old Spanish Trail. See a photo gallery of 20 species of cactus and learn the uses of these plants. Wheelchair accessible. Included with admission. 11 a.m.-11:30 a.m. June 29. 733-5153.

Space Drafts: Asteroids Fact vs. Fiction — Borderlands Brewing Company, 119 E. Toole Ave. Vishnu Reddy and Dani DellaGiustina with asteroid facts and fiction and the status of the upcoming OSIRIS-REx asteroid sample return mission. Pizza and beer. All ages welcome. 7:30-8:45 p.m. June 29. 261-8773.

Arizona Daily Star