The two candidates running to represent District 7 face off against one another on Wednesday night in Roxbury. Chuck Turner, who is facing federal corruption charges that he says are false, is running for re-election. Challenger Carlos Henriquez is making his second bid to topple him. The two-hour forum, at Hibernian Hall on Dudley St., starts at 6 p.m. The forum is sponsored by the RoxVote Coalition, the Dudley St. Neighborhood Initiative, and Democratic Ward Committees 9 and 12.