I DID ALL THE PLANNING FOR MY WEDDING LESS THAN A MONTH BEFORE WE GOT MARRIED!
It was CRAZY!
I had had plenty of time to plan it before that, but I did nothing in the way of planning. Mostly because I was in my final semester of grad school, and my final paper, which was dependant upon a group project, became very complicated.
And, my wedding was lovely. My Maid of Honour helped a lot, but even she did not start planning anything until less than a month before the wedding! Because I did not decide on a venue, or the flowers, or the brides maid dresses... LOL!
ALL I HAD DONE WAS THE GUEST LIST.
Oh, and I knew the date!
I flew from London back to NYC exactly 15 days before the wedding, but my dad suddenly died the day after I got home, so for the first week, I was mostly focused on planning his funeral.
I almost changed my wedding date, because of my dad's passing, but everyone had already had their flights booked, so we just went ahead with it on that date.
I think if you give yourself that amount of time you can totally do it, even if it is a big wedding - and you can do it from anyplace.
My wedding party was about 60 people.