If you ever happen to be walking around a Greek town or village and it seems that there are BBQ smells everywhere chances are it’s probably Tsiknopempti. (It could also be Easter Sunday but in that case the smell is the roasting lamb on a spit so you’ll know quite quickly which is which).
Tsiknopempti comes from the words tsikna (the characteristic bbq meat smell) and Pempti (Thursday). It comes about once a year, about two weeks before Lent starts.