Chris Jericho's band Fozzy has been officially confirmed for the upcoming Uproar Festival tour between August 17th and September 30th. Fozzy joins Shinedown, Godsmack and more for the festival. Fozzy has been left off the list for August 19th, which is the day off the Summerslam PPV. He is expected to work the pay-per-view and RAW the following night.
Fozzy is scheduled to perform on September 16th, which is the night of the WWE Night of Champions PPV. At this time, it is considered highly unlikely that Jericho will work the pay-per-view.
The festival doesn't have anything scheduled for Monday's, likely for travel reasons, which means that Jericho could possible still work RAW before flying out for his next performance. Clearly, he'll be a VERY busy man during this time.