Trog,
Sorry I'm not familiar with these events, but I went to the SCOT website and found that they have an event contact person with an email address and a phone number. You could check with him about whether non-members may attend. Hopefully they can, and you will, and, if so, have a great time!
Allen Sinclair, FSA Scot
Eastern Region Vice President
North Carolina Commissioner
Clan Sinclair Association (USA)