I'm not just saying this to be an ass, I promise... but I am more in favor of one big post, for the reason you guys are mentioning here. If it's only a couple people with browser issues, I think it might be easier to try and help/accommodate those people rather than risk a billion individual posts. Especially because the event is optional, so people may want to post things other than "come snog my character".
Or possibly breaking it into three posts like we have the taken page?