Hi Jena,
On a tram? Interesting! Are both bride and groom tram-crazy?
The only paid gig I've done so far was for the 50th birthday party thrown for this lady by her sisters on a historic rail-car. About 40 people on board. I went expecting to use my FA 35 and FA 50 a lot (I didn't have the FA 77 then) but since rail-cars are long and narrow, even the 18mm end of the kit lens wasn't great in terms of coverage.
Luckily, I had packed my DA 10-17 FE lensand that saved my skin! I used that lens for about 40% of my shots and they were VERY pleased with the results.
I see you have a 15mm FE lens... it might be a good idea to take it along, just in case
N.