As a fan of old-time radio, I just had to go the the 50th Anniversary (plus 2) for Those Were the Days, the currant program that broadcasts radio shows each Saturday afternoon. I knew that cameras would (surprisingly!) be allowed so I left the camera clubhouse with a camera, 2 lenses, several batteries and memory cards.
There were no reserved seats so I arrived early enough to find a seat on the aisle in row 4. Perfect chance to try the new lens and the distance to the stage was just right for the 70-200 focal length. No flash was permitted so shooting at either f 2.8 or f3.5 worked out at ISO 800. Here’s what determined the lens I used: bright stage lighting = no really dialed up ISO, moderate camera to subject(s) distance = 200 max focal length, no available camera support = Vibration Reduction lens.
Since this was a celebration of old time radio, you know there was a recreation of a radio program from 1947 using the actual scripts with period-appropriate music from two groups. A friend asked if I was the youngest person in the auditorium. No, some people brought their grandchildren.
Think about your next photo venue before you leave home so you will have the appropriate gear when you get there.