Here’s another item to add to your checklist of things to do at Bonnaroo – take a hot shower.As the festival celebrates its 15th summer in Manchester, shower stalls are one of the many new luxuries in place this year. The showers join flushable toilets and two-person cabanas as items which allow visitors to take a step up from roughing it.“It’s all part of the upgrades to make Great Stage Park the premier entertainment grounds in the country,” said Jeff Cuellar of AC Entertainment. “We’re continuing to look for events to have here outside of Bonnaroo.”Great Stage Park is the name that’s been given to the 700-acre farm where Bonnaroo is held.