I love when I hear from my couples that they've just gotten their marriage license, as I know that it feels so much more real to them at that point! It sure did for me!
In California, you can actually get your marriage license up to 90 days before the wedding. But, since there is no waiting period, you can also get your license right up until the very day of the wedding (although why anyone would add stress like that on that day if they didn't have to, I don't know!).