As a photography assistant, I have:

Driven the car.

Unloaded and set up gear.

Driven to Home Depot to buy decor.

Inventory/charge/empty/dump batteries and memory cards before and after shoots to make sure we never have a chance of running out of anything or losing data.

Book travel plans and rental gear.

Answered questions from clients, collected payments/deposits, fended off botherers

Ordered the food.

Dumped and organized the files.

Ensured backups are running.

Waved meat and cheese in front of subjects.

Etc.