The Bay Area Science Festival is a 10-day festival (with various events between October 9th and November 6th) where science & technology related lectures, exhibits, debates, concerts, workshops and plays are available to the public throughout the Bay Area.
The Discovery Days event will take place at AT&T Park on Sunday, November 6th from 11am to 4pm. There will be showcases and interactive exhibits, experiments, games, and shows, all meant to teach you something new while also entertaining you. Over 170 exhibits will overwhelm AT&T Park. Admission to this event is FREE.
Halloween Haunts and Happenings will take place at the Exploratorium on Sunday October 30th from noon till 4pm. Come and see (and maybe pet) giant insects, tarantulas, blood-sucking leeches, maggots and others. Dress up in your Halloween costume, try making and decorating sugar skulls! See some of the spooky and silliest animations of from the 1930s to the 1950s in the McBean Theater. There is small fee for the sugar skull making, but otherwise all Halloween Haunts and Happenings activities are included in admission to the Exploratorium.