Last year was my first year of riding and I rode 100km once and 80 or so many times, in the end put about 2500km in 7 months. This summer I will be doing a charity ride of 100km a day for 4 days.
In terms of preparation, what sort of rides should I be doing before the event? Would it help to ride 2 days at 100km, or even 3 days at 80km, a few weeks before the event? I've done maybe 50km after a long ride the previous day, but never back-to-back long distance (for me anyway) rides.