It seems finding many that post any information this early is a bit of a search. Hopefully you can google "Super Bowl 50 las vegas parties" some will show up.
The typical one's that I think off hand,
Blonde's @ Miracle Mile
Gordon Ramsey's burger joint in Planet Hollywood
Plaza Hotel Casino
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One that is confirmed is the "millionaire social club party" at the suites in the Palms,
Saturday you are invited to a lingerie bowl then Sunday all day for the super bowl party.
Cost
Hugh Heffner club $2500 for Sunday only
Millionaire club $4,000. for both days
Tickets limited to the first 100 males!