Bring your own favorite boardgame(s) and play with others. If you don't have boardgames to share, then just bring yourself along with drinks or snacks to hang out and potentially make some new friends. We did it last year. It was successful and a lot of fun!
This time we are going to Dessert Republic, which serves HK food, drinks, and desserts. Because it's a restaurant and for the owner to spare us the place to play boardgames without charging us:
0) No outside food or drinks are allowed
1) Every one of us needs to buy at least a drink and/or food there
2) Some of us may just continue with dinner there as well after 7pm
We just need to be fair, otherwise we wouldn't be welcome there again.