Celebrate the autumnal equinox by getting outside and getting active at Felix Neck Wildlife Sanctuary. The Mass Audubon property in Edgartown will host two events in honor of the season change this weekend. On Saturday, September 21, from 10 to 11:30 am, a group will stroll the sanctuary grounds for the “Autumnal Equinox Walk.” Participation is free for members and $5 for non-members. At 10 am on Sunday, September 22, Josey Kirkland will teach an outdoor yoga class in the field. Participants should bring water and a mat or towel and dress appropriately for the weather. The class is $10 for members, $15 for non-members. For more information, call 508-627-4850 or visit massaudubon.org.