Average indoor lighting is remarkably consistent: f:2.0 at 1/30 sec., EI 400. Open up a stop or maybe even two for dark spaces like bars, and stage lighting is something else entirely.
Most floodlit buildings at night are about f:2.0 at 1/4 sec., EI 400.
These two guidelines along with "sunny 16" and "moony 11" (the full moon is 1/ISO at f:11) cover a lot of situations.
If you can't carry a camera with movements, you can always tilt the easel in the darkroom to correct convergences.
Plasti-dipped wire letter holders available from an office supply place are the ideal thing for drying large batches of small RC prints--perfect for those who are participating in the postcard exchange.