Five Things to Know Today: December 9

1. Montgomery Mall holds a Pet Photo Night with Santa from 7 p.m. to 9 p.m.

2. Sha Na Na performs at Sellersville Theater at 3 p.m. and 7:30 p.m. Tickets are $39.50 and $55.

3. Do some prenatal yoga for $15 at Art & Soul Yoga and Pilates, 1690 Valley Forge Road, Worcester Township, at 10 a.m.

4. Check out the traditional Irish sessions today at 3 p.m. at Molly Maguire’s, 329 W. Main St., Lansdale.

5. Volunteer at Wentz Run Park in Whitpain today for the “Build a Trail Day” from 1 p.m. to 4 p.m. The park and open space board will be there, as will other volunteers, as they build a walking trail in the township.