Okay, here is the list of things you should be doing RIGHT NOW. If you are in a wedding lull period, if you are a procrastinating, if you are agonizing over bridesmaids dresses or wedding hairstyles, you need to be doing these things now. These are things I wished, as we got closer to the wedding, I had just done when I was thinking about it, or things that I was really glad we had taken care of and I didn't have to think about.
1.) Write your program text. Even if you don't format it, write the text, so it's ready to go when you do pick a fancy design or when you call it a day and print everything on a folded sheet of paper.
2.) Write up a weekend timeline. Even if it's just a draft - now is not the time to worry about being fancy, just get things on paper. I highly recommend making it a Google Doc so you can just share it with you FI and your bridal party.
3.) Make your shot list. At the very least, a list of the people in your family you want pictures of for formal portraits. I wound up making a relatively controlling one at the end of the day, saying, "please make sure to try to get this type of picture", which made me feel awful but also relieved.
4.) Pick and/or download fonts to use. Something readable but still fancy, whatever. They don't all have to be the same, you can just pick stuff you like. We used the same script for the escort cards, signs, and program cover but some people find that nauseating. Regardless, you should have these at your fingertips for when you realize something needs to be drafted or designed. Don't waste time later trying to find the perfect font.
5.) Make signs for things you might want to have around the reception area - sign for guestbook, sign for reserved seating, signs for favors, whatever. Just do them, or at least the text. Then use your downloaded fonts. Save the file - you don't have to print them just yet, the point is to take care of it.
6.) Pick readings or readers. We didn't do this early enough and wound up feeling like it was too late to ask anybody but the wedding party (who, at the rehearsal, we told, "hey, you're doing a reading." We kind of suck.)
Any other "do it, do it now" advice I missed? I'm serious here - if you don't do these things now, you'll be even more stressed right before the wedding because you didn't take care of it six months ago. We wrote our weekend timeline back in May and when October rolled around, it was a relief to just make a few edits and have it be good to go.