Colorado House Concerts: 

 http://www.aspenmeadowshc.org/

Folk Festivals

http://www.falconridgefolk.com

http://www.kerrville-music.com

http://www.bluegrass.com/folks

National & Regional Events

http://www.folkalliance.org

Looking for events in your area?:

http://eventful.com/denver/events/

http://www.westcoastsongwriters.org