One or two basses, the second left in the case unless needed (I am also one of those old-timers who cannot remember breaking a string in 40+years of playing)
Combo Amp
Gig bag has tools, spare strings, batteries, leads, tuner, a couple of rags, etc
Small bag with spare kettle lead, fuses, mics and clips, guitar stand, direct box, Zoom, gaffer tape, 2 mic cables
Maybe a mic stand and a music stand if needed (I cannot remember lyrics)