1. Will teams play on grass infelds?
If its all that's avaliable? Yes. If they choose to go to a tournament? No. I wouldn't go to any tournament that was grass infields.
2. Has a local or national tournament ever been held on a grass infield and if so what was the response?
I'm Australian and national tournaments WON'T be played on grass infields. Simply won't happen. Most normal grounds here, if they're exclusivly softball grounds will not have grass infields anymore.
3. Will teams play on the new type of artificial turff know as Fieldturf or Prograss?
No, no, no, no, no.
4. Will teams play in a week long, 7 game guarantee event?
No. Not enough games. As others pointed out, that's usually what's played over a two day tournament.