"Vårfrudagen" or "Våffeldagen"
March the 25th is Annunciation Day of the Virgin Mary - in Swedish "Jungfru Marie Bebådelsedag (9 months before Christmas).
The name comes from "Vårfrudagen" (Our Lady's Day) which in vernacular Swedish sounds almost like "Våffeldagen".
You can usually find electrical waffle irons being sold in your local supermarket at this time of the year. They are not very pricy and range from SEK 150 and up.
If you wish to make your own waffle mix here is the recipe: