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The occasion is the annual Rose & Sweet Pea Show in Deeping St. James, Lincolnshire.
The venue is the garden of the vicarage, as it still is for this event nowadays, and I'm told that the date of this photograph is 1912. I would have put it a few years earlier.
The building in the centre is the Church Hall. It's still there today. You can just see a small part of the Priory Church of St. James in the top left-hand corner. I am told that the ladies are bowling for a pig but I would have expected them to use wooden balls for that. These look more like crown bowls.
Whatever was happening, everyone seems to be enjoying themselves. I wonder how many of those men came home unscathed in 1918?