The Thunder Bay District Health Unit is looking into possible food poisoning following a banquet at the Moose Hall on Fort William Road.
Officials say that about 54 people who were at the event on Friday became sick.
They hope to contact as many of the 270 people that attended the event as possible, that includes people from Greenstone, Dryden, Kenora and even Hamilton.
Meantime health officials say charges have been laid and until further notice, the Moose Hall can't serve food.