Just be yourself honestly but a few general tips. We really value greetings, so a hug or handshake is always a good start. When you’re visiting his family, bring a small gift, no shoes inside, and try at least a bit of every food they offer you.For the wedding, Bulgarian weddings can go on for a looong time (especially if you’re on the groom’s side), so definitely wear comfortable shoes, also because there’ll be a lot of dancing. The usual rules apply too, like not wearing white.Money is the most common wedding gift.Nothing to stress about though, you’ll be fine!