Too much equipment can be a hindrance and risks you busy with the contents of your bag. Usually, I take two cameras and perhaps a third lens.
For the event below, I just took the Z7ii with the Z 24-120 f/4 , a 1kg tripod (and the SB-700 flash not used), a 32 GB XQD card (overflow card SD 32 GB not used). The main challenge was to get the big group focused, every head in line of sight, sunglasses off. - It was a partial success... Another photographer and I took the same scene. I did ~30 interval shots 1s . He did self-timer with multiple exposures .
Very good. Depending on my clients budget I shot with two bodies and two primes alone 85 on FX, 20 on DX.
If there was more money I brought my own light plus a second photographer with a third camera and a zoom.
Scouting is important. You should anticipate where you will take the shots and where the light will come from at the planned time and what happens when in rains
PS: unedited frame with an example of how my own light will change the scene on an otherwise dark spot with the most important scene in a Dokostyle: exchange of rings.
PPS: very important: Speak to the priest on what you are allowed and what not. You do not want the priest as your enemy
PPPS: I will look in the archives to find the edited shot (13 years ago)