I know not of which songs you speak.
However I do have an opinion.
As someone who loves to hear new(To me!)songs,and would not be able to come and hear you sing a song at the correct time of the year.
If i ever have the pleasure of hearing you I would like to think I had heard what I could think of as your choice of great song;s,of the type /genre you love best.
I would hate to think I had missed out on one for the sake of it being a few days short of particular date.
I suppose there is a proper time and indeed place for the performance of some songs,dances&ceremony's.
But if you want to keep them alive for a wider audience and not just for those already in the know please sing as you feel.