Don’t miss the fun on Friday, October 30th. For a fun, safe Halloween event, children and their parents are invited to Trick-or-Treat on Mt. Diablo Blvd. TRICK or TREAT STREET will take place at 4:00pm in boo-tiful Downtown Lafayette. A great place to begin the walk is our wonderful Lafayette Library and Learning Center. You can park at the Library and begin the walk. All participating businesses will display a poster and have balloons at their door. Trick or Treating is for children 9 and under.