I've seen photos of the Portuguese conventions, and they're very impressive. My wife wants to visit Portugal and I've considered our putting together a trip that would allow me to visit and take a couple of days to attend in a future year. However, I don't speak Portuguese - just French and English.
There is no Canadian association, although when there was years ago I was a member. It's very hard to get killies here - the US border is not friendly these days and Canada's killie keeping population is small and dispersed over a vast distance. Most of my killies are descended from ones I brought back from Africa. It's not as simple as going to the aquarium store...
Your project is valuable to the killiekeeping and aquaristic world, and I've been following it on Facebook. It must be offering you a fantastic overview of these many trips people have made to learn more about killies. It seems like an inaccessible, impossible adventure until you do it, and are fishing in a stream. The first African killie I caught was Epiplatys huberi, which I still keep, and the first Aphyosemion was joergenscheeli (a surprise for me) which went to Denmark with a colleague. For now, the fish are out there.