Unknown celebration on an unknown date at East Norton Hall. Any ideas?

1937 Coronation Celebrations in the grounds of East Norton Hall

1953 Coronation Celebrations in the grounds of East Norton Hall

1977 Silver Jubilee Celebrations in the grounds of Walnut Farm

Children in fancy dress at the 1977 Silver Jubilee Celebrations 

Prizes awarded to Children at the 1977 Silver Jubilee Celebrations 

2002 Golden Jubilee Celebrations at East Norton Hall