Good photographs add value to the events and that value increases as the time passes.
I am a social animal, and good at photographing people and events, as long as I find you and your event okay and I am in geographical proximity, I am happy to do it - for free :-)

After the event the photos need to be looked through, the bad ones and not-needed ones eliminated, the remaining ones are scaled down and watermarked - that is in everyone's interest, so that the photos can be traced back to their source. Also, metadata are added with photographer name, date, copyright/use information etc - those metadata can be read in Photoshop, or with online tools, such as Metadata2go. Oher metadata about the event, watermarks and other logos can also be added, the cost of that is not high. It is best that the event organiser gets involved at this stage, so that all the options can be discussed, agreed and implemented.
The editing process can take some time, depending on my workload.

The images can be placed online - freely accessible or with restricted access, if there is a possibility of getting a payment (generally, there is), the payment can be shared with the event organiser - up to 50-50.

What's important is that the images are taken, and so, they exist, if the event is public being photographed is the default position, if the event is private most people are happy to be photographed, those who do not want it can signal this in some way - such as wearing a red badge or a sticker.

Note that I don't do weddings - that's too private for me - thank you.