Officials at Ruby Falls, 1720 Scenic Highway, will light up the iconic cavern and pathway in purple this weekend as a celebration of Prematurity Awareness Month for the March of Dimes. The organization is marking its 75th anniversary and its ongoing work to give the 4 million babies born in the U.S. each year a healthy start in life through research, education, vaccines and medical breakthroughs. Regular admission fees apply. To learn more, visit www.marchofdimes.com/tennessee or www.rubyfalls.com.