RMRA SX Series
Colorado's amateur/club indoor supercross points series, run by the nonprofit Rocky Mountain Riders Association at Front Range fairgrounds arenas plus one round in Raton, NM. The Round 2 venue is billed only as "Southeast County Fairgrounds", most likely the Southeast Weld County Fairgrounds in Keenesburg. Shares no weekend with the AMA Supercross Denver round or the AMA Pro Motocross Thunder Valley round, both explicitly marked 'non-RMRA' on RMRA's own poster.
Tracks on MX Tickets sell gate entry, practice days and camping online. Book before you turn up.