There is a meeting at Six Towns, nr Draperstown at The Shepherds Rest pub over the weekend of 19-22 April...camping in the field behind.
it's a joint meeting for The Thumper Club, Royal Enfield owners club and the Irish Sidecar Club, but anyone's welcome.
We went last year and had a great time, so I've booked the ferry to go back again this year.
Dave.