Red box with microphone & audio cables, etc.
Duct tape
Packing tape
Markers, blue tape, masking tape
Flip-chart paper
catalog envelopes

Clip-board (2?)

Old sheets to cover things (e.g. printer)

Laptop & cables, external drive, USB stick

external DVD drive?
HDMI projector cable?

Cell-phone AC charger.

Extension cords, outlet strips, etc.

Checkbook

Big water storage container (plastic 5 gal?)

rubber bands; paper clips;