“bring a spade/shovel/wheelbarrow to archery” day

Following the great success of our “bring a hammer to archery” day a couple of weeks ago when we managed to get the fence finished (thanks to everyone who helped!), we are now going to have a “bring a spade/shovel/wheelbarrow to archery” day next Sunday (14th September).
We need to dig out the base, level it, etc, for the new shed we are getting. So if anyone can stay behind after archery next Sunday for half an hour or so, that would be great and if so, can you bring a spade or shovel to help!  Anyone who has got a wheelbarrow would be useful as well!
Many thanks in advance
Matt