• Lake Renwick Heron Rookery – Open daily from 8 a.m. to sunset through Feb. 28. Hiking, running, bird viewing programs. Visit bit.ly/renwickreopens.
• Affordable pet vaccines – 5 to 8 p.m., 2 Paws 4 U Pet Bakery, 1736 Essington Road, Suite C, Joliet. No appointment necessary. For information, visit www.spayillinois.org.
• "Owl Pellet Investigators" registration deadline – Event is 6 to 7 p.m., Dec. 18, Isle a la Cache Museum, Romeoville. Join a naturalist to investigate the connections between owls and their environment, and learn how to dissect an owl pellet to see what the owl had for dinner. Free; ages 10 or older. Register at ReconnectWithNature.org or call 815-886-1467.
• Cat adoption – 5 to 7 p.m.; also 1 to 3 p.m., Sunday, Bolingbrook PetSmart on Weber Road. Call Humane Haven Animal Shelter at 630-378-4208 for information or an appointment. All Humane Haven cats are spayed or neutered, microchipped, FeLV/FIV tested and have their distemper and rabies shots.