Ultimate Tango invites everyone to a first anniversary celebration of its Medford Square studio featuring live music by the Boston Tango Orchestra.

The evening will begin with an open level class from 7 to 8 p.m. (no partner necessary, but “plus-one’s” are always welcomed), followed by milonga from 8 p.m. to 1 a.m. (refreshments will be served). At 9 p.m. there will be a special performance by Ultimate Tango owners-teachers Hernan Brizuela and Anita Flejter.

Admission free. Please RSVP by emailing UltimateTango@gmail.com.

Ultimate Tango offers Argentine Tango classes (including Milonga and Vals) at the Beginner, Pre-Intermediate, Intermediate, Pre-Advanced and Advance levels. Specialty classes, workshops and private lessons also are offered.