It’s never a good idea to invite someone to a party without permission.

It’s kind of party etiquette. If you don’t get an invite, you don’t show up, unless it’s the kind of party where plus ones and plus twos are welcome with open arms. But you can usually tell what kind of party this is and what isn’t. Anything wedding-related strictly requires an invitation, and we should all know this. Weddings and the events surrounding them are expensive ordeals. They require a lot of planning and a lot of capital, so you can’t just show up unannounced, nor can you invite anyone without the couple’s permission. Even if you’re family. This is pretty basic etiquette, but that doesn’t mean that people don’t ignore it in the service of their selfish desires. That’s what happened in this situation, at least.