The Hyde St. Pier Chantey Sing is the first Saturday of every month, 8 p.m. to midnight--in April, that will be the 1st. I have a feeling that an April Fool's Day Chantey Sing is not to be missed, but be sure and call first to make sure there is no date change. Call and register at 415-5567-67435. Free admission, open jam session. The Starry Plough sessions are every Sunday from 8 p.m. at the Starry Plough in Berkeley--also free admission. Have fun!