What happens if our photographer is sick on the day?

It's usually in the contract, and, yep, they would likely send a replacement. Or they might contact you and see what you want to do.

Photographers know photographers. We've all got little black books of people we work with -- competitors, friends, etc. A friend of mine does funeral livestreams, and if he can't do a job, then he'll pass the work on to a competitor, and the competitor will do the same for him.

But, for what it's worth, I think most photographers who have been doing this for a while will keep themselves "match ready" before a wedding. Get enough sleep, avoid eating anything that's going to give you an upset stomach on the day, etc. 

And even if they're not 100%, hate to say it, but the strong probability is that they'll show up anyway, because they want to make sure the job is done right, and they want to get paid, basically. I know a famous photographer who showed up hungover for a wedding.

It's important to discuss this scenario with your dream photographer before hiring them to ensure that you're both on the same page about what will happen in the event that they're unable to photograph your wedding due to illness or other unforeseen circumstances.

Many professional photographers have a contingency plan in place for situations like this. They may have a second photographer or backup team that they can call upon to step in and cover the wedding in their absence. Some photographers may also have a clause in their contract that outlines their policy for canceling or rescheduling a wedding in the event of illness or other emergencies.

When discussing this with your photographer, be sure to ask about their contingency plan and what would happen if they were unable to photograph your wedding. You may also want to consider purchasing wedding insurance, which can provide coverage in case of vendor cancellations or other unexpected events.

Ultimately, the most important thing is to communicate openly and honestly with your photographer and to make sure that you're comfortable with their plan for handling any unexpected situations that may arise. This can help give you peace of mind and ensure that your wedding day is captured in the way that you envision.

Your Photographer should always have a Backup Photographer. We have three if one of us is sick. WE also make sure they are available before the day or if we have one backup. 

This has only happened to me once because of a positive covid infection (fun times)... we always have back up photographers if something goes south! x

I think everyone has covered it below really well.  

Photographers know theres no re-dos of wedding days. We either push through, and make sure we cover the day, even if we are unwell (I know photographers who have shot weddings while having food poisoning). OR we make sure someone covers the day for us, normally with a similar style to our own. 

The most important thing is to talk to potential photographers about what the back up plan is before booking, because every one will be slightly different.
And make sure the plan is outlined in your contract with whoever you book, so you know it’s agreed on, and you won’t have to question it down the line :)

Most photographers have a big community and are always able to find replacement for the day. I've never canceled or needed replacement and I like to keep it that way, but I do have a list of 10+ other photographers who would always help out last minute ??

This is a very rare occurrence, I doubt you will find many wedding photographers who have had to cancel shooting a wedding due to illness.  I would have to very sick, or restricted due to the illness being contagious ( like covid)  to not shoot a wedding.  A wedding photographer should have this occurrence covered in their contract. My contract says I will give the bride and groom the option to get full deposit back, so they can find another photographer, or I would arrange for another photographer to cover for me.  I am connected with many other wedding photographers through my network, and I would usually know what photographer would suit the bride and groom's requirements. Ie a style similar to mine.    Additionally  - editing is a huge part of the eventual outcome of the images, and I would most certainly take on the role of editing the images from the wedding to be sure the client receives as close to my style as possible. 

Check the contract before you engage your dream photographer about things like this. A replacement is usually engaged for you and usually of the same calibre as their reputation depends on it. Best wishes!

As a professional wedding photographer, it is important to always have a plan in case of unexpected events such as falling sick on the wedding day. If I am unable to attend the wedding, I will immediately contact another photographer with a similar level of experience and style to take my place. Having a good network of professional photographers can help ensure that the wedding is still captured beautifully, even in the case of unexpected circumstances.

Part of being a successful photographer is having good networks. I personally have never had to forfeit a wedding due to being unwell or any other reason. But we are all human. Your photographer should be able to have good people around them in a similar style and price point they could call on in the case of an emergency or being unwell. Your photographer should be doing everything they can to find a replacement for you.