I would strongly advise against using the slowest fim you can find as these generally have the highest contrast and are the most finicky in terms of controlling contrast in variable conditions.
I would recommend either FP4+ or HP5+. Pulling the latter always gives me exceptional results. If you have time to test, you should conisdeer pulling HP5+ in a speed shedding developer if you are worried about the possibility of maxing out at your fastest shutter speed. HP5+ in Perceptol 1+1 would be a great combo as it is not mushy but crisp, has wonderful tonality and the speed will be about 160-200 in normal use and probably about 125-160 if pulled significantly depending on contrast.
HP5+ pulls nicely in Xtol for avge contrast negs from high contrast scenes but this dev makes good speed and might not be ideal therefore.
Steer welllllll clear of the adox/Efke 25/50/Pan F type films. Fine in when spot metering and doing the zone system but a nightmare for variable shooting like a wedding party.