Six things to do this weekend: June 2-4

Six things to do this weekend: June 2-4

The science of “Avatar”; Community Chorus’ “Eternal Light”; Pride Week entertainment; Cambridge Arts River Festival and sculpture race; “The Orbiting Human Circus” live podcast performance; and Eighth Annual Carnaval Somerstreets Festival.

Five things to do this weekend: Dec. 4-6

Five things to do this weekend: Dec. 4-6

“Same Sex Marriage Portrait Project” art reception; “An Evening with ‘Radio Boston’” book talk; “The Prison Problem” talk featuring Prodigy; All-America City Grooversity Festival; and “The Lion & The Clown: A Rumi Lovesong for Beauty & the Beast” musical play.