Sending you lots of calming vibes!
Ok, so the thing about weather forecasts and the cancun-mayan Riviera area is that it is probably going to change like 100 times between now and the actual day.
Right now I'm checking my weather app for Cancun and it says that April Friday 17th is going to be Sunny and a high of 30c and low of 25c.
I'll give you two examples of how unpredictable the weather forecasts are. I went to Jamaica a few years ago and the wedding was on the Wednesday. The bride and groom were freaking out because the forecast called for rain every single day. Like.every.single.day.and thunderstorms. We arrived and it was sunny and freaking hot every single day. It rained the last day we were there and honestly we were ok with that because we had had way too much sun anyway. The wedding was a hit. There was a bit of overcast and then the sun just like plowed through.
Last year when I went to the Mayan Riviera around this time they forecasted rain the entire time we were there...it rained...just one day and then it passed.
It's good to talk about plan B just in case. Maybe get some pictures of the hall so you can envision what it looks and how you could fill it up without breaking the bank with their overpriced flowers.
I don't know if this would cheer you up, but this is what my weather app says!