Dwelling on the past may not be a good thing, but preserving history is. Learn how at a FREE workshop in Lone Tree on Thursday, May 19. Speakers from Colorado Preservation Inc. and the Highlands Ranch Historical Society will be on hand from 6 p.m. to 7 p.m. at Memories to Digital in Lone Tree to discuss Colorado’s most endangered places and efforts to preserve them. 8481 S. Yosemite, Ste. B, Lone Tree, 303-799-1677.