Can you plan a wedding in 4 months?

We got engaged 6 months ago and honestly have been so busy with work and so many things that we realized time flew by and we never planned the wedding. Now, it's may and we wanted to get married this year in september b/c we've been together forever and just want to move forward in life so i'm considering planning this in 4 months. People think i'm crazy, but is it really that bad? We have decided on a venue that serves food/drink and does the ceremony already and we know our officiant, DJ, and wedding coordinator. We also have talked to multiple photographers and they are all available for our date so really it's just the florist, which i'm fine with costco flowers so i'm not that worried about that. My friends do want to do a bachelorette, but it will be a 2 night thing so nothing crazy. We also know we will order our invites on Zazzle and already have the save the dates ready and the wedding website ready. The venue doesn't need much decor b/c it's on the ocean with white roses already. I have gone to several dress places and they say they can have the dresses I liked ready by August or some of them can have it by June 1st. I already have a checklist of things we need to do, made the song list, our bridal party knows they are in our bridal party. I feel like we can pull this off and be able to move forward in our lives....but am i missing something? People look at me like i'm crazy. What am i missing? *hoping for positivity and reassurance here, b/c i'm nervous*