I doubt there was a run on memberships yesterday morning, but the event was quite obviously to show some sort of extra benefit of being a member, the food and drink was at least free.
To be fair it does say EXCLUSIVE members only event, the thing is would it encourage a non member to go WOW I must join so I could go to that?
They said members would get exclusive events and offers and this was one of them, as I said, I doubt in itself it will make a blind bit of difference to anyone deciding to join or not.