Well I don't think I would like to recieve an invitation for tons of tournaments. As more Fellowships are created - as more tournaments are created, the invitation could start to add up pretty quickly.

What I think would be a better suggestion is to by default, when a person joins a fellowship, to automaticly add it to their favourites board. (Where they can then remove it if they want to) - But that way more people will see the "XX new" and then go and read the board, and hence - find out about new tournaments and such.