tips,
you have to think/move/shoot very fast, the solemnization ceremony last less the 5mins, since it is solemn (serious) ceremony so you can't directing or interrupt the process if you miss out anything.
the group photos, couple photos, or any details shots, you can slowly arrange them and shoot, keep shooting till you think you got the shots
techniques,
this is an event, so if you are competent to take photos of any type of events, shouldn't be a problem.
gears and equipments,
you should already pass this stage of asking such questions, anyway, any dslr with kit lens plus a hotshoe flash is good enough cover such event. I shot many paid ROM assignments with D100, D70 with kit lens plus a SB800 before, no issue at all.
hope this help.