All-Star cheer teams practice year round 6+ hours/wk with the primary goal of a earning a bid to the Summit. Events are planned and announced a year in advance, including competitions Oct-April which allow the top 3-10 teams (out of hundreds) to qualify for a chance to compete at the Championships in Orlando. All-Star rooms (not Pop!) are set aside because some teams will not qualify until less than a month before the event. Any rooms not booked would eventually be released, but most guests don't would be happier elsewhere.
If you don't want to be around them, plan accordingly.
Division I All-Star Cheer Summit Championships, May 4-6, 2018
Varsity All-Star Dance Championships, May 5-6, 2018
Division II All-Star Cheer Summit Championships, May 11-13, 2018
In addition to filling the All-Star resorts (not Pop), teams in the past have overflowed into Coronado Springs which is closest to ESPN and has been headquarters for some events, though this is likely change because of ongoing construction.