You can celebrate homecoming even if your college days are long past at UC Berkeley’s annual Caltopia. Billed as the “Two Greatest Days on Planet Earth” by its very enthusiastic boosters, it offers the community a chance to explore the lovely campus and grab some freebies, without dropping a dime toward tuition. Enjoy live music and performances throughout, enter to win some give-aways, get a massage and shake hands with that famous Berkeley Bear, Oski — all brought to you by Cal Rec Sports.