Group rides are one of those things you can't just reschedule because coordinating everyone's time off and routes takes forever. Missing it while your buddies are out there would eat at you every time someone mentions it later. You can rent a motorcycle here https://getrentacar.com/en... . Plenty of bikes listed depending on what part of the country you're in and what kind of ride you need. Go through the details on mileage and insurance because rallies eat up distance and you don't want to get hit with fees when you bring it back.

Man, that timing couldn't be worse. You're looking at ordering parts, waiting around, doing the actual work, and by then everyone's already back from the rally posting photos. Rentals are tricky because most places cater to tourists who want a weekend cruise, not someone doing serious miles with a riding group. I've heard decent things about what EagleRider's got in most cities, they usually keep a range of bikes so you're not stuck with just one style. People also use Twisted Road when they want something that isn't just the standard fleet bike, more personal selection that way.