Here you go, have a look at this link. It will give you an idea of what the rows are about.
We at Dover Marine Services supply the pilot boats for the rows which generally take place on Fri, Sat, Sun & Mon. When of course the weather allows. Anything more than a F2 means the rows are rescheduled
Next ones are 29th Sept & 4th Oct.
http://www.ahoy.org.uk/row-for-us/channel-row-challenge/