ah thats a pity Gorthyn....there's plenty of other events you might be interested in in and around us most are on in the summer but some later on in the autumn too - just have to keep an eye out on the web
http://www.historic-uk.com/HistoryUK/LivingHistory.htm
there's a link to one of the web sites i keep a look out on

and as for volunteer work - thats pretty easy to get into in archaeology. The main site for looking is:
http://www.britarch.ac.uk/

i have missed doing some aspects of archaeology since having my little boy but as he is now 3 and at nursery more I am gonna be working as a volunteer for my old archaeology unit once a week soon if i hear of them wanting any volunteers for excavations i can let you know.