Never been to the Drayton show, but isn't the Calgary one supposed to be the best one out of all of them for finding old stuff? All the small shows like this I find have very little by way of milsurp guns, but a high demand for milsurps. Average sightings will be mosins, yugo m98's, lee enfields and maybe the odd RC k98. But yet these draw lots of attention, and you are more likely than not to see it being carried out in the hands of someone rather than still be sitting on a table.
But I still keep going to all of them that I can, hoping something interesting will be found!
