Central City, Colorado is an amazing mix of Colorado history combined with modern entertainment, amenities, & activities. The Central City Opera House offers traditional theatrical venues for plays and opera, the Upstage Theatre Center adds comedy, improv, & concerts. Festivals and celebrations happen throughout the summer months.
Check out the schedule for the summer Festival here: http://www.centralcityopera.org/index.cgi?CONTENT_ID=1325
My sister, who lives in Colorado, just saw an Opera there, and reported a wonderful, professional performance. Check it out.