Summer Rock the Roof concerts - June 18th, 2009 IRRMA presents FREE Thursday night concert/dances during the summer. The 10 consecutive Thursday night shows begin on June 18 and will conclude on Aug. 20. A full line up of entertainers will be posted in the near future. Plan to spend your Thursday evenings in the Roof Garden at Arnolds Park! Concerts start at 6:30 p.m.