Preschool Story Hour: Butterfly Homes. Mass. Audubon Society Meadow Brook Conservation Center. 414 Massasoit Road. Worcester.  10:00 a.m. to 11:00 a.m. For ages 3 to 5 w/ an adult. A thematic hour of a story, an activity, and a naturalist-led walk. Space is limited, so register early for this popular program.  Be prepared to go outside. Fee: $7 Members, $10  Non-members.  Fee covers adult/child pair; $2 per additional child. Registration required. 508-753-6087. www.massaudubon.org