As we head into the now annual Icelantic's Winter on the Rocks fiesta this weekend, the Red Rocks summer concert schedule is starting to take shape. Jack Johnson is slated to bring his From Here to Now to You tour to Colorado on Monday, August 18, with Michael Kiwanuka. Tickets for the show range from $54.50 to $64.50. Presale tickets are available tomorrow to those on Johnson's mailing list, followed by a general on-sale this Friday, January 31, at 10 a.m. John Prine & Emmylou Harris, meanwhile, are due on Sunday, June 1. Tickets for that show range from $44.50 to $75.00 and also go on sale this Friday, January 31, at 10 a.m.