There is the West Wilts branch of the national club, (AROC), that meet the first Thursday of each month in Warminster.
I have never attended any of their meets, (even though I live less than half a mile from their organiser). I usually go to the AROC Wessex section meetings which are first Wednesday of the month in St. Leonards, Ringwood. There is a great annual show at Sherborne Castle and usually an Italian day in Bristol but that looks to be in doubt this year unless somebody steps up to organise. There are Saturday morning 'surgeries' at Autolusso Ferndown which are generally a social chit-chat.
There is also a North Devon/Taunton/Somerset facebook page but I have not been to any of their functions. Hope you find something.