We are very lucky in th UK and especialy in the Yorkshire area as there is always at least one race during a given weekend somewhere within an hours drive. The following websites provide excellent race calendars.
North East Races An excellent website with a race calendar and including links to entries, results, latest race information. Lot of work goes into this to keep it up to date.
UK Results The original online results service and race calendar. Results archive going back to 1994, superb online resource containing links to lots of races, Road, Trail, Fell, some multi sports events. Also has online race entry facility for some events.
Run Britain More official site with race calendar ans some online entires.
Fellrunner.org webiste. Central point for all Fell races and results
BOFRA British Open Fell Runners Association. Another Fellrunning body. This one tends to focus on the shorter races (AS category), really good series with some great races, pretty low key but great and all inclusive fun. These usually have childrens runs before the senior. Mainly entry on the day, even the odd free event!
Yorkshire Vets Link to website with Grand Prix and Championship series for Yorkshire Veterans (Over 35 but can run as a guest if under)