How/when did your parents and FH's parents meet? This probably seems silly, but ours haven't met in person yet. We want them to meet, and they want to meet each other, but it just hasn't happened yet with trying to work with everyone's schedules and life circumstances. Our parents are pretty local to us. They all live within 20-45 minutes away.
We have friends/family members that have said their parents will meet each other at their engagement party, but we aren't having one so that isn't an option for us.