I am going to go scout out a trustee sale in a week, Is there just one auctioneer or multiple?
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If multiple what is to stop them from all holding auctions at the same time? Is there a way to figure out who is representing?a particular property or trustee?
It is up to trustees when and where to hold the sales - no real limitations on it under the law that I’m aware of other than that it must be accessible to the public and not a bank holiday. So yes, it is possible to have multiple sales at the same time. I remember one day running back and forth between two auctions around the corner from each other… spent more time in the gym after that. 
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If you are in a county with overlapping auction times the only thing you can really do is choose between them, or have multiple people, one for each auction.