Here are some the in-town venues I know about with music during RockyGrass week, starting with Thursday and Friday, and I'll try to add more as I find out! (check websites for more):
Thursday July 26 concert in Sandstone Park (free) 6:30pm: "Sally Van Meter & the True Bluegrass Band" (with former Open Road musicians Keith Reed, Caleb Roberts, and Eric Thorin from Colorado and special guest Yoseff Tucker from California) and
http://www.lyonscolorado.com/events/sandstone-summer-concert-seriesThursday July 26 ($5 cover) at Oskar Blues 8-11pm: Meadow Mountain, Masontown, Lonesome Days!
http://oskarbluesfooderies.com/wp-content/uploads/2018/07/Lyons_music-schedule-JULY_for-social-01.jpgFriday July 27 (free) at Stone Cup noon–2pm: Mark Lavengood Band
http://www.thestonecup.comSaturday July 28 ($10 cover) at Oskar Blues 9pm: In the Whale
http://oskarbluesfooderies.com/wp-content/uploads/2018/07/Lyons_music-schedule-JULY_for-social-01.jpgSaturday July 28 (free) at Pizza Bar 66, 9:30pm-12:30am: The 89s (a supergroup of talented musicians who happen to live in Lyons: Eben Grace, Brian Schey, and Michael Thompson)
https://www.facebook.com/Pizza-Bar-66-359142207293/ Listening to:
KGNU radio