I think you missed the point. You've not even posted an announcement in the thread trying to hurry people up. You need to set a deadline and stick to it. If nobody responds from a duel then kick both of them. If one person responds and the other doesn't before the deadline, kick the inactive one. If both respond and cant decide a date, set one for them. Like I said it's pretty clear you lost interest in the tournament which is why it's ground to a halt. It's your responsibility to stop that happening, not the players. Players duel in actively administrated tournaments.