How much Transformers "Cons" is there?

A bit of background; This is the first time I've been on the boards consistently at this time of year, and I'm noticing that it seems that every week there is a new Transformers Con of some kind. With BotCon a few weeks ago, SDCC this week, TFCon next week, and with the announcements of of different Transformers Cons. So I am rather curious as to if it's always like this every year or is it just that it just kinda happened this way.