The annual Moab April Action Car Show is Friday through Sunday, April 26-28, downtown. Vehicles from 1900 to 2018 will be around town for your viewing pleasure. Free admission for spectators.
Joel Tuhy discusses “Where Do All the Wildflowers Go?” from 6 p.m. to 7 p.m. Thursday, at the Moab Information Center, Main and Center. Tuhy examines the intervening span of time between when flowers fade and when they blossom the next year. Free.
Colorado River Science is 6 p.m. at Star Hall, 159 E. Center. Historian Roy Webb will discuss Colorado River history. Sponsored by Grand County Public Library. Free.
Colorado River Science, 7 p.m. at Star Hall. Author and journalist Jonathan Thompson will discuss how “politics, science and power interact in the West.”
Pop Up Roller Rink, 6 p.m. to 9 p.m. at the Old Spanish Trail Pavilion, 3641 S. Highway 191. Free for locals on final Fridays of the month. Out-of-towners, just $5 for a skate rental.
Castle Valley Book Group. 11 a.m. at the Castle Valley Library. This month’s book is “The Line Becomes a River,” by Francisco Cantu.
Amasa Run 2019. This trail course challenges runners on a races ranging up to 25 kilometers. For more information call 385-202-2972.
Annual Spring Plant Sale; 9 a.m. to 1 p.m. at Youth Garden Project behind Grand County High School. All proceeds support youth and community programs. For more information call 435-259-2326.
Canyonlands PRCA Rodeo Queen Contest. Locals compete to see who will represent Grand County as its Junior and Senior Rodeo Queens. For more information call Krista at 435-260-7942.
Earth Day Celebration is 1 p.m. to 4 p.m. at Mayberry Native Plant Propagation Center. For more information call 435-259-6670.
The Unruly Mystic: John Muir: This documentary “explores the remarkable life and influential works of a patron saint of environmental activism and Father of America’s National Parks. 7 p.m. to 9 p.m. at Star Hall.
April 29 – May 3
Moab Photo Symposium. For more information visit moabphotosymposium.com.