All the above .... and take something waterproof to cover your stuff quickly if it looks like rain.

Some DPM will do, it's transparent and lets buyers see your goods. You can whip it off as soon as the sun comes out again.

A groundsheet is good to put under your display table so you can display more goods underneath and not have to put them on wet/muddy grass.

Always have two of you for the busy time at the start. One to set up and one to watch the stuff you are unpacking. Lock all valuables in your car and use a "bum bag" to keep your takings and car keys in. Never leave cash unattended even for a moment.

Any jewellery should, if at all possible, be in a glass fronted display case or pinned to a sturdy mat of some kind. Most people are completely honest but the one or two who are not can really spoil your day.

If someone buys something and wants to leave it with you while they visit more stalls, lock it in your car and tell them when you are going to leave. Nothing worse than waiting an hour for them to return when you have had enough and just want to go home.

Anything left over that you really don't want to take home can be offered to the "charity shops".

Have a good time

Christine