Vendor Frustration

I need to vent. We were originally supposed to get married this weekend, but like many, had to postpone until May 15th next year. Recently we have been getting anxious about that date and wondered how realistic it would be that we would be able to host 130 guests with all the restrictions in Chicago. After talking to our venue, they encouraged us to postpone again because they don't currently have a kitchen staff, and won't be bringing them back to work until the indoor dining restrictions are lifted long term. Since last Thursday, we've been going back and forth with all our vendors, trying to find a common date for end of next year. Yesterday morning, all but one vendor got back to us that November 12th would work. The last vendor confirmed late afternoon they were available as well. While we didn't originally want a Friday wedding, we got excited for this date because it will be our 6 year anniversary, and all other Saturdays didn't work for us or didn't work for at least one vendor. I emailed everyone right away we were good to go with signing updated contracts, and the DJ says "oh sorry, we had another contract come in this afternoon. Can you pick another date?". I get we didn't technically have a signed contract with the new date, but most vendors will put a temporary hold on that day to give us enough time to reach out to everyone. He knew we were confirming with multiple people, and we literally had talked about it that same day when he confirmed he was free that day. Now we either have to pick yet another day, which isn't an option unless we postpone to 2022, or we have to pick another DJ. This just really sucks that they gave away the date without giving us a reasonable amount of time, or even a courtesy call to see which way we were leaning.