So what interests do you have that your DP will understand, and the other way round?
My DH will never get opera, or really a lot of classical music, but bless him, he'll come if me or the oldest are performing in something, he does try that much. Luckily 14YO loves both, so I can do that with them.
I'll never get either horror films or rollercoasters like DH, but he does the former with his best mate and the latter, luckily, 14YO is into. I'm glad they have this thing to share. I suspect DS might get into horror and watch it with him later, but at the moment he's terrified of even the slightest bit of gentle scare in family shows. But DH swears he was the same as a kid before he got into horror.