You can't do much to repair your fitness in six days, and if you try you'll just exhaust yourself. If you can't start fit, at least you can start fresh. I'd stick to relatively short rides - an hour a day is fine - at medium intensity. Then I'd rest on Thursday and just do a relatively easy spin for an hour on Friday. You need to focus on getting back to feeling comfortable on the bike.
Then on the ride, just concentrate on finishing. Ride at your own pace, don't go out too fast, don't worry if you seem slow in the hills. You'll probably suffer the following day - that's when you'll pay for the time off - but while a two-month lay-off will undoubtedly have compromised your fitness, there's no reason why it should stop you from completing the ride.