It's a fundraiser for the Toronto Zombie Walk: http://torontozombiewalk.ca/
For an additional fee you can be subjected to your very own Zombie Attack! (They say they will wash any mode of transportation: my son is trying to persuade his friend who rides a unicycle to attend and undergo a Zombie Attack - to be filmed, of course :bouncegiggle: )
(Sorry if this is more 'fun' than 'weird': I did not know where else to put it)
Sounds pretty cool! I wish we had more stuf like that around where I live...