Military Spouse sudden deployment and wedding

For background, we got married in January earlier this year for financial reasons but no one knows. Close family members were talked to about the what if since we lived seperate and lets just say the conversation wasnt pretty. It was a walk into a courthouse and stamp the paper kinda thing with the plan always being to have an actual wedding because ultimately its what we wanted anyway.
Prior to any date setting he checked in with his superiors and was told his time frame to expect potential deployment was April - August with a potential extension into September if nessasary but would not be anything over that. So for example if he deployed in July then the max would be September. This was confirmed multiple times, he put his leave request in months ago and told it would be approved.

Hes suddenly being told to get ready to deploy with it being highly likely to extend into october or further. We have family that have already paid for tickets, honeymoon, venue partially paid and more. He was a week away from getting into base housing after being on the wait list and has had to cancel it / get at the end of the line on the list again. I feel like an ahole but he's told me that people are getting out of the deployment for babies on the way or medicine and I'm beside myself thinking everyone else's life events are being ok'd but ours is not even though we confirmed everything along the way to make sure we were good. Whenever he comes back from deployment he will be homeless because of the base housing thing and the end of his lease at the prior apartment with roommates plus potentially pissing off alot of family with money sunk and money that has been sunk into the wedding.
I'm understanding of deployment and I know it's part of the gig. I just don't know what to do, I'm panicking because if he's extended the honeymoon, family tickets and other things can not be moved or refunded. I feel so bad for my friends and family that have gotten tickets since we're 3 months out from the wedding. We both want this wedding and it has to take place before I move across the US because I'm planning, making and setting up stuff myself. I have everything stored at my house. There is also the factor that we were saving up for moving costs and I've already put in my final day notice with my work so they can get an overlap position for me to train the person. Now with everything going on I may have to last minute tell people the weddings canceled and cancel my final day notice but that will screw my work over with hiring my replacement since the hiring process can take 1 to 3 months.
We can potentially talk to the venue about moving the date if even available and hope they will honor their word to accommodate. But it remains that everything will come down to last second notice of the weddings happening or not. The honeymoon can not be changed and will be a complete loss so will family members plane tickets, and all the other more minor things such as rsvps. His mother has already been kinda nasty to him saying he should have expected it which we both agree but at the same time disagree since he was told several times that it was approved and they would make it happen. Even some of his immediate superiors are giving him a hard time.
Can someone please give me some advice? I plan to let everyone know it may have to be canceled or if we're lucky moved. How am I to expect several people that play a major part in the wedding that have to fly in to wait for last second notice or pay expensive ticket price for flights at the last second especially if they have non refundable tickets for the original date. Do I continue to sink money into a wedding that may not happen? We still need to book someone to "marry" us and I'll have to pay a deposit. If he's not back in October, we've agreed there is no way we can have the event in November because of Thanksgiving, veterans day, several close family members wedding anniversary where they won't be there and my neices birthday which knowing my sister she'll make a stink. That puts the potential wedding into December but we were having an outdoor ceremony under an oak, which will probably be dead by that time with decor that has small white pumpkins. Which would delay my final work day being November 30th and moving cross country December 1st.
It's a complete mess, I'm a plan for the worst person and feel so awful about the money people have already sunk into this wedding. To say the least I'm freaking out, my job in itself is a high stress position (goes with the territory) and I also have to take over all his finances while he's gone from across the country which just seems stressful to figure out making it happen when i have to sign stuff for him.
I apologize for the long post. It's just a whole ordeal.