If you have a chance to see a show or performance at Overture Center for the Arts - do it! I believe I saw Trampled by Turtles (among others) in Overture Hall and Fitz and the Tantrums in Capitol Theater. Both shows were superb and the venue only heightened the experience - to say the venue is classy isn't giving it enough justice. It's well maintained and if you're drinking - you get an adult sippy cup for wine. Bring it back and get a discount on your next visit.
A few years back I DJ'd a wedding in one of their banquet rooms and for someone traveling behind the scenes - the load in was especially easy with their over-sized loading garage. But the wedding couple and guests had a fun time and I can only imagine how their pictures turned out!
Now, not everything at Overture requires a ticket for admission. They do host MadCity Sessions that includes free music in Overture Hall's lobby from 6-8pm one Thursday a month (6 months a year). It's free music from local and larger musicians! Definitely something to check out if you are looking for free music to experience. You can also buy some food and drinks, while sitting around a table and enjoying the experience with a large group of friends!
One last thing, check them out at night (I can't recall if it's just around the holidays or year round), when they light up Overture Hall's lobby with colored spotlights, it makes for a great photo op or just a spectacle to see!