If you're participating in some kind of Halloween activity there's a good chance your plans are already laid out. If you want to add to your party agenda and go for a costumed bike ride that won't make the authorities question you, the Sierra Club has gracefully provided that opportunity.
SC requests that participants have a properly functioning tail/headlight and make sure your costume doesn't interfere with your bike chain. So, zombie bride may be out.
6:30 p.m. FREE. Sierra Club, 503 W. Franklin St., Boise, 208-384-1023, idaho.sierraclub.org.