The summer season will (unofficially) end with a bang at Caroga Lake this weekend as The Ultimates take the stage and fireworks light up the night sky.“We’re ready to rock,” said John Rosencrans, the band’s drummer. The Ultimates, a Capital Region-based party band, will kick off its Caroga Arts Music Festival set — a variety of rock and pop hits — at 7 p.m. “Everything from modern music, like Ed Sheeran or Maroon 5, to old classics like Bob Seger and The Cars,” said Travis Rockenstire, the lead vocalist of the band's repertoire. “We just try to hit everything for everybody, we try to make…