There's a reason Mardi Gras in New Orleans is called "The Greatest Free Show on Earth." It's a larger-than-life party where any and everything goes—and that's part of the reason masks are worn.

Enjoy live samba, dance performances, music and food. Wear Mardi Gras-themed costumes, masks and beads and join the party hosted by Carnaval San Francisco. 5-10 p.m. Tuesday, Feb. 13. Free ...