Thanks Mildred for your suggestions. My research revealed Primrose Day is in April so perhaps kisser is the link to the February event. I was expecting Valentine to be the solution to one clue but alas no.
The other 12 I think just refers to the 12 months of the year which don't actually feature in the solutions. Off to have another trawl through the grid to look for something unique about February?
Well done Dotsecond, problem solved. That looks right and the events taking place each month must be the secondary twelve in the preamble. I don't know that poem, it's a pretty one, thank you!