Nothing funny about slavery, but um maybe you could do like an Underground Railroad trivia activity, where the teams have to answer questions about the lesson in order to proceed to the next 'station'? Geez I'm a Black person, and even that sounds a bit insensitive haha. Well I guess not insensitive.... but I wouldn't want the students to not understand the seriousness of it, you know? Cuz slaves couldn't just say the right words and go ahead, it was a such a life or death situation.
Well that was just my idea. Because it seems pretty educational and not toooooooooo fun and carefree haha.
Well, just an idea off the top of my head. I'm sure others will come along with something better.. Or I will add something else if I think of it. Good luck!