Probably best if ppl just check zoos websites / social media info than repeating it all here isn't it?
Not everyone has social media though, or would necessarily think to check it the day of a visit (the latter being the sort of thing I am liable to, which I freely admit is a small failing).
If you can post on Zoochat then I reckon you could check zoo's own websites as per my first post - which is where you would find the most up to date news on what is going on. Just seems a more reliable option imo.