Rule of thumb with FB events is to expect 1/3 of what registers to show up, though that's not to say that 70 or more might actually show up. Arriving early is a good idea. Be sure to find Brian, our tournament host if you have any questions.
Turnout, while a great thing, isn't what will keep us continuing to do this- sales is. We are a business and need to make money in order to stay open and continue hosting great events like these. Remember that we don't get any of the entry fees (100% of it goes to the prize pool) and we don't charge for gametime during the tourney so the only way we're making money is through food & drink sales. If you want us to continue hosting MKX (& fighting game tourneys in general) make sure you buy food & drinks and tip the waitstaff/bartenders while you are here!