I've created a bay area concert calendar that you can access either via my blog (in the left pane) or at this ical address: http://www.google.com/calendar/ical/0g3kura1oj4o15fj3nnubmo8ac%40group.calendar.google.com/public/basic.ics
As it stands, I've only got concerts that I might go to. So - right now, passion pit isn't on the list because I already have tickets to Animal Collective on the same night.
I'd love your feedback - so please comment to let me know what you think.