Very valid point Tabulah. When I did WW at least half of my points a day would go on crisps, then I'd be starving by the end of the day and go over my points. I managed to lose here and there, but always felt hungry and hard done by.
Might be a bit late now, but Trills, if you have something substantial before you go, and just get a few nice things off the buffet, that's what I'd do. Unlike the christening I went to a few weeks ago where everything was covered in pastry and breadcrumbs so had no option but to enjoy it all.