The Democratic candidates for the Third Middlesex District State seat will square off in a forum in June.

The forum will be held on Saturday, June 16, at 1 p.m. at the Arthur Clark Government Center in Waltham, according to a press release form the Third Middlesex Area Democrats. Candidates Mike Barrett, Alex Buck, Mara Dolan and Joe Mullin will attend and the public will be able to ask questions.

Incumbent Susan Fargo announced recently that she is not seeking reelection.

Bill Fowler, a commentator on the Waltham Cable Access channel, will moderate the forum. Waltham Cable Access is sponsoring the event.

Signs or placards not allowed at the event.