Questions: Relationships

If a friend or relative invited you to a commitment ceremony (not an actual wedding) would you come or not?

The reason I've asked if because my parents were invited to a relative's commitment ceremony recently. It was a private invitation with just them and their close friends that knows about their situation. The woman is disabled and gets benefits from that. If they get married, they'll remove her from those benefits so her boyfriend is trying to work harder to get promoted so he can add her to his policy, they'll get married afterwards, she'll continue getting benefits through his insurance and they can file taxes together. They have no kids but would like to adopt.

Due to the specific nature of the case, my parents are coming to the invitation. However, if it were done for the simply reason of hating marriage or the typical ''I want marriage and he just wants a commitment ceremony'' and no one is struggling financially nor suffering anything, other than refusing to married, then nope. In that case, my parents wouldn't be driving 2 hours away, excusing themselves from work and go out of their way for a ceremony that's not an actual wedding. I think he same too. It depends on why. I'm not missing school for nothing.