As I didn't get an email I guess this is for Club members only not Season Ticket Holders (Not to start the debate again, just curious)
I got one, and haven't paid the membership, but think that might be because I'm a foundation ST holder? Interestingly I didn't get an invite for the members evening earlier in the year that got cancelled, but have for this one...
iirc FS ticket holders are automatically upgraded to members
and ditto re the invites last time and this