as someone who enjoys playing boardgames, what i would caution against is trying to run some kind of boardgame cafe. the problem with that is you end up with customers like me playing a long game occupying a table for 3-4 hours. maybe everyone buys a drink and half the players buy a meal. the revenue per table per hour will be low compared to a normal cafe or restaurant where you could cycle multiple groups through the table in the same time, and where the expected revenue per customer would be higher.
the places where board game events thrive are where the fixed costs (rent, wages to staff a bar/kitchen, etc) are subsidised by something that isn't board games. i.e. where the venue is open anyway and has spare capacity to fill a few tables with board game players who stay for hours and do not spend money quickly. in australia this is often at a pub/club which has an old spacious venue with lots of tables, where the business is kept afloat by income from a room full of people losing money playing the pokies (slot machines).