Generally speaking, formal wedding companies have expressly stipulated that employees are not allowed to eat wine or receive red envelopes at customers' banquets.
If the people at the wedding wanted to eat at that time, it only showed that the wedding was not professional enough.
I'm from Wuhan, and it's all stipulated by the wedding companies here. I think the wedding industry in Shanghai should be relatively mature.
However, on my wedding day, my mother-in-law forced them to drink, and that was another matter. It's not surprising to be polite to many people.
You will be very busy that day, and it will take time to change clothes. You can tell your husband this idea in advance and let him deal with it. Just be happy and be a beautiful bride.