Well, we have St-Yves' day, or was the day of St-Aubin-du-Cormier the breton national holiday (don't really remember, the latter is not commemorated as a saint, but as a battle we, sadly, lost against the french... but we usually blame it on the welsh archers regiment which assisted our own ).
What about the Cornish and the Manx, what are their holidays... They always seem to be the ones everyone manages to forget...