World Masters Athletics have announced that the Scotiabank Toronto Waterfront Marathon will host the 2018 Marathon World Championships. The race is on Sunday 21st October. So if you want a crack at being a world champion but not have to leave North America then this could be your chance.
https://canadianmasters.ca/cmawp/wp-content/uploads/2018/06/WMA-Marathon-Championship-2018.pdf
Event info
http://www.torontowaterfrontmarathon.com/event-info/marathon/