Give the host a gift
If someone invites you to have dinner with them, it’s customary that you bring a gift. If fact, to be on the safe side, if anyone hosts an event that you’re attending, go out and purchase a tiny gift to present the host. Finding the right gift can be a bit troublesome, but you have to do it, no ifs, ands, or buts.
Don’t worry about the host not receiving the gift. They might do the whole, “oh, no, no, you didn’t have to!” and push it away at first. However, you should persist on handing it over, and they’ll eventually take it from you. This is also how you should behave when you’re on the receiving end.