We and our trusted partners use technology such as cookies on our site to personalize content and ads, provide social media features, and analyze our traffic. You can read more about it and change your preferences here.
It depends on the party/culture.
In Canada, anyone could come to a wedding, but you had to have an invite to go to the reception.
I guess here in the US they do invites for the wedding too? Someone correct me if I'm wrong.