The local group of a national and highly-regarded charity that provides support to patients and their families who are dealing with cancer hold an annual Christmas fund-raiser at an up-market nearby hotel. For the past 3 or 4 years, they have asked the camera club to press-gang someone to take pictures of the event - and this year I lost!
I enjoy portraiture but have zero experience and probably near to zero expertise when it comes to events. Any and all advice on technique (for example flash or ISO), settings (I almost always use Aperture priority and adjust shutter speed and ISO to suit the circumstances but I'm tempted to go Auto for this), and composition (Individuals, groups, performers - it's a choral night with a choir - and what about permissions?) would be very gratefully received.
Don't know if it makes a lot of difference, but the camera will be my trusty D750 full frame, and if it's to be flash, I'd probably use my SB-700 in Auto/TTL mode and on camera with diffuser, but it can be used off camera alone or with an SB-R200 (although I expect that the night will be more street photography than studio). Lenses - tempted to go with the 50mm prime but will take the 24-85 and 70 - 300 zooms,just in case.