Guests live 16+ hours away, and don't know each other

My soon-to-be and I met online, as well as my friends and I. Him and his family live 16+ hours away, and my friends live 6+ hours away (one in another country!). My friends are really excited to attend, and I'd love for them to! I'd also love for my future in-laws to meet my family, but I'm not sure how to gracefully allow them all time. We don't have the best budget. Once my S.O. and I get married, he's moving to my state permanently. I just don't want to make anything weirder than it already is, let alone cause any extra expenses.
Is there suggestion to how I can make this any easier on everyone? I spoke to my sister and she mentioned that it was essentially what my S.O. and I wanted, and I agree. It helps me when it comes to stress around our plans, but it does not help with the outcome of the matter. We won't be having a grand reception. Only a small ceremony and a group activity before and after.
Would it be appropriate to keep things into one day? Do I need to make plans to bring the families together somehow prior to the ceremony? What can be done outside of the wedding date to make things easier?
I've tried to connect in the past, but I think I failed to communicate it clearly.Thanks for any help I can get!!