Aspen is a very environmentally-concious town. So Earth Day is always celebrated here in some way. This year, in addition to celebrating Earth Day, scientists young and old will also participate in a March for Science. Participants will meet in Paepcke Park on Saturday at 1pm and at 1:30, they will march (or bike or rollerblade) through town, ending back at Paepcke Park to enjoy speakers, science activities, information booths and music. The event ends at 4pm. Everyone is invited for this festive, free event.