The Wonder Ballroom has been humming along as one of Portland’s busiest mid-sized concert venues for more than a decade. The room’s 778-person capacity allows it to host a wide variety of acts, from internationally touring folk singers to fast-rising indie rock bands to popular local artists. Offstage, the Wonder offers a top-flight experience, from its Spanish Revival-style architecture and spacious main floor to the full bar, basement café, and unobstructed sightlines from the balcony. It’s a comfortable place to see a show.