The Students Activities Council (SAC) is a group of UW students that program concerts and events for all UW students. All UW students are welcome to be a member of the council. SAC usually plans a weekly event on Wednesdays and Fridays, many times in the Union or A&S Auditorium. These events are almost always free and open to everybody.
Student activities: http://www.uwyo.edu/union/cac/sac/
Student organizations: https://uwyo.collegiatelink.net/organizations