good call on the "de"briefing. Briefing would have made more sense.
As far as two external flashes...I hear ya there too. Unfortunately I don't have a second and niether does she so I'm outta luck there (definitely no money to splurge on one at the moment either). Because of that I'll probably use the 50mm prime as the second lens choice at the indoor reception... either that or her 11-18 (I think tamron). I feel I am a bit limited by equipment.
Anyways I shot the "ceremony" this morning. It wasn't your traditional wedding... it was a mormon/LDS wedding so no one actually sees the ceremony...I just take pictures as they come out of the temple and then all the traditional poses with family and the bride and groom.
So did it go well?... hmmm... the lady who is the "professional" wanted me to shoot with the external flash firing every time. I understand that for some of the group portraits but not necessary for the candid/up close shots. I felt like for the most part the external flash was unneeded because it was perfectly light out and there weren't harsh shadows because it's a little overcast. I felt like it was perfect. And of course when I turned the flash on, faces were more washed out and it just didn't look as good. Lucky for her

the battery died part of the way through and I acted like I hadn't noticed.
Also just a note... a couple times she took her camera to take some photos while I shot with my camera. When she handed it back it was in the fully automatic portrait style. This just goes to show how much this lady really knows. Correct me if I'm wrong but how many "professionals" shoot using the creative styles?? I didn't make a fuss... just switched it back. Its her daughter's wedding so I imagine she's a little stressed and I don't want to contribute to that.
I shoot the reception later on tonight... (i know its sort of a weird schedule). I'll let ya know how that goes too.
Thanks for reading if you got this far.