Hallowe'en Fancy Dress - with Tragic Footnote

As far as is possible with fancy dress, I am estimating that this photo dates from the 1930s, given the padded shoulders on some of the ladies' dresses.  It could also be 1940s.  The location could be a private house or a village hall, there are few clues one way or another.  On the reverse is written:
"Halloween.  These are a few of our Association.  The one marked with a X was instantly killed last week and was the President."