Jackson Junge Gallery, 1389 N. Milwaukee Ave., is exhibiting "Sex Sells: The Power and Influence of Sexual Imagery," and to wrap up the exhibit the gallery is holding a cocktail hour with a costume contest.

Attendees are invited to don their best "Mad Men" attire during the cocktail hour. Whoever has the best costume will receive a prize from the show.

The event is free. Attendees must be 21 or older.