The Dandy Warhols perform at the Mystic Theatre in Petaluma on Dec. 13, 2016. Alessio Neri/STAFF. PETALUMA — It’s sort of refreshing that The Dandy Warhols didn’t really have an agenda at their Tuesday night show at the Mystic Theater. The Dandy Warhols, Telegram, Warbly Jets  9 p.m., Saturday The Fillmore Tickets: $27.50. Kicking off…