The deadline to register for the 18th Annual Tucson Earth Day Festival and Parade is April 6 for exhibitors and parade entries. Go to www.tucsonearthday.org or call 206-8814. Exhibits should provide information and hands-on activities about environmental products or issues. Parade entrants should reflect this year\'s parade theme, \"It\'s in Your Hands.\" Floats must be human-powered or use alternate fuel.