Joining DCDR as a member couldn’t be easier, see the membership webpage here.
To be a volunteer, you need to be a member first. If you are a member, then just bring yourself along any Wednesday or Saturday and introduce yourself. Usually you’re given a tour of the various projects being undertaken and you’re free to work on any that take your fancy. We know it’s hard giving up a day of your weekend, and that you mightn’t be able to make it every single week, so don’t let that stop you! We don’t mind how often you come down, as long as you do.