Got To Do This Some Day
Mount Wilson Observatory's 60 inch reflector is available to rent: $450 for half night, and $900 for the full night. The focal length is 24380 mm--so even with a 25mm eyepiece, that's 975x. I would be amused to find out if the viewing conditions will tolerate that. I've read an account by someone who used the 60 inch reflector at 600x power on Saturn and the Moon back in the 1950s. Hmmm. Max group size is 25.
Let's see, if about 10 of us could pick a night, that would be $45 a piece for a half-evening. Of course, coordinating a time might be a struggle.