I really think that the club tournaments time to play is really too short for the members invited have to play. 72Hrs is the max as I understand and that is a bit too short. At least a week would be a modest norm.
And further more, to let the members know that there is a Tournament in process . You have to let them know in some way because unless they hit the country club bar there is no way for them to know that there is a tournament in their country club in process.
If I could send a message to my friends, in one shot ,to let them know that I organized a TOURNAMENT CHALLENGE it would incourage people in playing tournaments because they would know about it, and so better the whole system of creating and playing into tournaments.