I think that the majority of radio rallies held on school playing fields and halls will not get the go ahead until late spring/early summer at the earliest. Many such as The Luton radio rally in May are yet to confirm that the event will take place.
This link shows the main body of radio rallies and events due to take place over the coming year and seems to be updated fairly regularly.
http://www.g4rga.org.uk/All.html
Christopher Capener