I believe that there are meetings at the Hill of Uisneach in County Westmeath, Ireland for the Beltaine Fire Festival.
Uisneach (pronounced "Ushnick") was where the Irish Fire Druids had their eternal flame ... alledgedly.
Have thought about Ynys Mon before, but the locals seem a bit funny. I think Ireland is probably the best bet as things seem to be a little less spoilt .
Blaidd