Mystery Black Rabbit photograph...

This is from an unknown publisher and the view has been enhanced, as the actual card was very faded. It shows a large group of people posed on the river bank in front of the pub. There are at least one hundred and seventy five individuals, predominantly female with about twenty males and a few children. 

It was posted in Maida Hill, London on July 1st 1907, sent to Miss N. Robson, 32 Simpson St, Newcastle on Tyne. 

The message: "This is the place near to Arundel Castle which I mentioned. Pretty spot fine boating etc. Hope you enjoyed yourself at home. Love to all, Yours (Asroz ?)." 

This gives little clue as to the nature of the event, so it remains a mystery.