Post to the CALENDER what you do know. Very few CALENDER posts have complete details. You have most all of the important information:
Dates - Registration and play
Entry Fee
Prize Pool
First Place Prize
Prize Pool based on 126 players
Wildcards offered
That's plenty of information. If everyone held off on posting to the CALENDER until they knew all the details, there would not be a CALENDER. Besides, if you find out more details you can edit the event at any time. So POST, POST, POST, to the CALENDER. It will probably help attendance which will encourage the casino to have more tournaments.