I agree with Caytlyn. There's nothing they have to do. Maybe you can rephrase your question... are you looking for ways to involve them? Is that what you mean? If so, maybe just ensure you keep them in the loop. Let them know some of your ideas (only if you are welcoming their opinions) and share some details as you progress with your planning. When people are far away it's easy for them to feel like they aren't involved and if that's important for you and for them, then make a point of communicating with them about wedding-related things.
They aren't required to do anything. Are you asking about what they traditionally pay for?
If so, I believe, traditionally, the groom's family would take care the rehearsal dinner and marriage license. I think the groom, traditionally, would take care of marriage license, rings, tux, transportation for his guys, etc.
All of this is contingent upon his family offering to pay for these of course. I wouldn't ask or expect it.
If you want to suggest something for them to get involved in, try to pick a weekend when you are meeting with a vendor, doing a menu tasting, etc, if you don't mind having their opinion, and inviting them to visit. My MIL had never met my parents when we got engaged, so she flew down to go menu tasting with us and look at hotels for the room block. She ended up planning a rehearsal dinner while she was there, but that wasn't prompted by me.
My Future in laws live out of state. During the venue search, I'd send FMIL emails with links and updates as we visited. They're taking care of the rehearsal dinner. And I also planned dress shopping for when she could come down. Of course, I love my FMIL and feel we have a pretty good relationship so I wanted her to be apart of all of that. She prompted the rehearsal dinner planning herself.
Mine are out-of-state as well. All that I care about is them being able to fly in for the wedding! That being said, I will probably see if my FMIL is interested in or willing to help out with some set-up tasks at the actual wedding, and we'll probably do a late engagement party at my future in-laws' place next spring so that we can still celebrate with some of my FH's extended family that probably won't be flying out for the wedding.
Mine are out of state. They aren’t doing anything, and I didn’t expect they would do anything. My mom could be a million miles away and still want to do stuff so it really depends on the person. You or your fiancé could ask if they want to do anything but I’d be careful to word it like you’re not asking for money (because you shouldn’t be). My future mil drove up for a venue tour 🤦🏼♀️ (Long story, we weren’t even engaged yet and she made me go look at a venue) And for dress shopping. The next wedding related thing I will see her at is my bridal shower.