All invited to learn about and help collect macroinvertebrates—including insect larvae and crayfish—from Huron River tributaries to measure the river’s health. Kids welcome if accompanied by an adult. Two start times. Rain or shine. 9 & 10:30 a.m., various places as assigned. Free. Preregistration required at hrwc.org/volunteer/roundup. (734) 769–5123, [email protected].

Oct. 3 & 4. All invited to design, build, and experiment with robots. 11 a.m.–3 p.m., 220 E. Ann. $16 museum admission (babies under 2, free). (734) 995–9439, discoverscienceandnature.org/aahom.

Oct. 3 & 4. A chance to tour 13 newly remodeled Ann Arbor homes. 11 a.m.–5 p.m., various locations. $10 includes both days (age 16 & under, free), in advance online at a2tix or and by cash or check at any of the tour houses listed. (734) 996–0100, bragannarbor.net.

Every Wed.–Sun. A carnival atmosphere with a variety of family-oriented fall activities on this family farm, including wagon rides, a petting farm, a corn maze, and more. For an extra charge on Sat. & Sun., an apple cannon, paintball, apple or pumpkin picking, and other activities available. Cider & donuts available. Also, on Oct. 3 & 4, local artisans & crafters sell their items at the Craft Show Weekend, and on Oct. 24, young entrepreneurs sell homemade items at the Kids Market (noon–4 p.m.). No pets. 11 a.m.–6 p.m., 5565 Merritt (east of Carpenter), Ypsi. Weekend admission: $27.50 (babies under 2, free). Weekday admission: $18 (babies under 2, free), online only at wiards.com. (734) 482–7744.

Every Fri.–Sun., Sept. 19–Nov. 1. A large corn maze with 3.5 miles of trails and 3 exits to allow for routes of various lengths. Also, a U-Pick pumpkin patch, hayrides, petting zoo, pedal cars, straw maze, and yard games. On Sept. 27, Family Fun Day (11 a.m.–3 p.m.) features ice cream, balloon art, kids activities, and live music from the Saline Fiddlers. 11 a.m.–9 p.m. (Sat.), 11 a.m.–7 p.m. (Sun.), & 5–9 p.m. (Fri.), 6175 Daly, Dexter. $16 (ages 5–12, $13; age 4 & under, free with adult admission). blastcornmaze.com.

Every Fri.–Sun. A large corn maze with 3.5 miles of trails and 3 exits. Also, a u-pick pumpkin patch, hayrides, petting zoo, pedal cars, straw maze, and yard games. The corn maze is illuminated and guests get a free glow stick on Glow Maze Nights (Oct. 9, 16, & 23, 5–9 p.m.). On All You Can Carry Pumpkin Day (Oct. 25, 11 a.m.–7 p.m.), for $10 you can purchase all the pumpkins you can successfully stack and carry down the lane. On Pumpkin Smash Day (Oct. 30, 5–9 p.m.), each guest receives a free pumpkin to smash, which is then composted or fed to the farm’s animals. Costumes encouraged for the Halloween Spooktacular (Oct. 31, 11 a.m.–3 p.m.). 5–9 p.m (Fri.), 11 a.m.–9 p.m. (Sat.), 11 a.m.–7 p.m. (Sun.). 6175 Daly, Dexter. $16 (ages 5–12, $13; age 4 & under, free with adult admission). blastcornmaze.com.

Every Sat. & Sun. A chance to view LSNC birds of prey and its Critter House animals, which include frogs, turtles, snakes, and other species native to Michigan. Noon–3 p.m., 1831 Traver. $5 suggested donation. (734) 997–1553, lesliesnc.org.

Fri. Oct. 2 & 16 and every Sat. & Sun. (See review) During the Friday Adult Open Hours (age 18+ only), conservancy staffers show some animals that live in the rainforest, including a two-toed sloth, a Dumeril’s boa, an iguana, and a red-footed tortoise at 7:30 p.m. On Sat. & Sun., staffers show a two-toed sloth, a Dumeril’s boa, and an iguana at 1 & 4 p.m., and a red-footed tortoise at 2 & 3 p.m. All tickets include a chance to see the conservancy’s other animals. 7–9 p.m. (Fri.) and noon–5 p.m. (Sat. & Sun.), 4950 Ann Arbor–Saline Rd. $15 (kids ages 2–12, $13; under age 2, free) cash or credit at the door only. (734) 929–9324, thecreatureconservancy.org.

(734) 973–8424 (Cinemark), (734) 316–5500 (Emagine). Tickets $12.50 (except as noted) in advance at fathomentertainment.com/events and at the door. Cinemark (4100 Carpenter, Ypsi) & Emagine (1335 E. Michigan Ave., Saline). 

Oct. 3 & 7: “Così fan tutte.” Live (Sat.) and prerecorded (Wed.) broadcast of the Metropolitan Opera production of Mozart’s comic opera, a rare blend of high-spirited farce with psychological acuity and emotional depth. This production sets the story—about 2 soldiers who decide to test their sweethearts’ faithfulness by wooing them disguised as foreigners—in a carnivalesque environment inspired by 1950s Coney Island. Italian, subtitles. 1 p.m. $24.

Game vs. Toledo. This month’s home schedule includes a double-header vs. Detroit Mercy (Oct. 3, 1  & 3:30 p.m.), and single games against Bowling Green (Oct. 9, 5 p.m., free). 6 p.m., Alumni Field, 1114 S. State. Tickets $8–$25 at mgoblue.com/tickets & at the gate. (734) 764–0247.

Every Fri.–Sun. Three different audiovisual planetarium shows suitable for all ages. T. Rex (noon) describes the iconic dinosaur’s scientific and cinematic history (includes scenes of dinosaur violence); The Sky Tonight (1 & 3 p.m.) explores the current night sky, with tips on how to find the cardinal directions, constellations, and planets on your own; and Tales of the Maya Skies (2 p.m.) immerses viewers in the wonders of Mayan science, examining how Mayan scholars developed a sophisticated understanding of astronomy, architecture, and mathematics. Noon, 1, 2, & 3 p.m., 1105 North University. $9 at the gift shop. Limited capacity. (734) 764–0480, ummnh.org.