POPULAR FOLK PHYSICIST Harvey “p = mv” Quaggle will be singing songs from his new monograph Ain’t I a Strange Loop? tonight at Memorial Hall, 7 p.m. Backup band and frequent collaborators The Heisenbergs may or may not make an appearance.

The Three Rivers Morris Dancers’ Guild will hold their annual Morris Dance this afternoon on Flagstaff Hill in Schenley Park. All persons named Morris are invited to attend.

The Wilkinsburg Civic Ukulele Orchestra begins the first night of Wagner’s Ring cycle tonight at 8 p.m. in the parking lot of the Burger Barn. Bring your uke and strum along!

Tonight at the East End Deposit Bank Arena, stunt driver Cuthbert Rollbar will crush eighteen monster trucks with a specially outfitted Mini Cooper.

Installation artist Eli “Bonkers” Johnson opens his newest work, “Drug Store,” today at the Pharm-Aid on Bland Street. Visitors will enter a scrupulously exact rendition of a retail pharmacy and will be able to “purchase” items of “merchandise” from the “cashier.” Mr. Johnson requests that visitors not mention his name or the exhibition to the “manager” of the “store,” in order to avoid disrupting the illusion.