Just as a follow up, the reception pictures turned out fabulous. I ran the 50/1.4 the whole night, f/4 - f/5.6, 800-3200 ISO at full stops and 1/125 - 200 shutter to adjust for ambient, and manual flash between 1/16 and 1/8, with a couple of shots at 1/4. All bounced off the ceiling as I had white 10' ceiling all around.
I had a couple of fu-bars where I didn't turn on flash, or forgot to point to ceiling moving between landscape/portrait orientation, and a few where I dropped down below f/4 and forgot to switch back, but I think I did get close to 85% including composition and timing.
I was making a way bigger deal out of it than it needed to me. Nothing award winning, but mission accomplished!
Thanks again for all the responses! I'll put a few up in this thread with settings once I get processing.