I'm mentioning this here because the Eastern Canada Regional Rides and Events and Charity Ride forums have to be some of the quietest backwaters on the Internet!
I've seen this Ride posted here in previous years but not this year. I'm not involved in organizing it but I have done the 100k option 2 years in a row. It's a lot of fun, very challenging because of the hilly terrain along the Oak Ridges Moraine. It's a great cause and there's none of the pressure and "VIP" nonsense you see with a lot of other charity rides.