I've personally been to most of these and have enjoyed each and every one of them. I should disclose that I am one of the two founders of Food & Chatter and we're friends with most of the people behind the other events. They are all awesome, depending on what you're in the mood for. I haven't attended the Grand White Dinner though as I considered it a bit expensive but I've visited the Taste of Cape Town food fair several times. Even though this is quite a new phenomenon of "secret" and "underground" dining it is nevertheless dining at an astonishingly high quality level with the added benefit of meeting new people and experiencing dining in new and unconventional spaces.