We prefer banners (1170 pixels wide, 433 pixels high), but anything will do.
TIP! If you create a banner using the abovementioned dimensions (exactly), you can also use it on Facebook.
The image will fit perfectly on Facebook. You won't even need to reposition it.
Then you send us the same image.
If your event has a Facebook page (and it should), you can upload the cover image that you uploaded to Facebook.
We're talking about the big image at the top of your event's Facebook page.
Also upload some other pictures of your market and stalls. Please make sure these pictures are of reasonable quality and that they give the viewer a feeling of being at your event. We will select the best of these pictures and use them to build your page.
Again, when in doubt, ask a 15-year old.