Island in the Sun Blackjack Tournament - Binion's Gambling Hall

Three nights lodging, Free entry, Appetizers during 
registration night (Fri 5/22). I'm guessing by invitation 
only this information is from mailer. No information about 
format and could not find anything on their website. Sounds
like the actual tourny is played on Sat and Sun. Does say 
you do not have to have a room to play so possibly you can 
enter without invite???