Are there any particular religious or cultural celebrations in Italy on which special food are eaten?

Catholicism seems to stress fasting more than celebratory eating.

Fish on Fridays. Communion wafer and wine.

EASTER: lamb, taralli di pasqua (egg stuffed bread), chocolate eggs, spring vegetables

CHRISTMAS: panettone/pandoro, torrone, bombardino (egg nog)

FEAST OF ST JOSEPH: zeppoli (donut holes)

GOOD FRIDAY: hot cross buns

However in Italy, every celebration involves delicious food!!

Here are some specific ones:

RISOTTO FESTIVAL: in Piedmont in May

FISH FESTIVAL: Liguria in May also

LEMON FESTIVAL: in Campania in July (lemoncello, lemon sorbet)

WHITE TRUFFLE FESTIVAL: Piedmont in October

CHOCOLATE FESTIVAL: Umbria in October

TRUFFLE FAIR: Tuscany in November

Here are some more: https://www.theguardian.com/travel/2016/sep/22/ita...

Yes, traditional foods are often part of a holiday celebration:https://jewishfoodexperience.com/celebrating-the-j...

We like to say there is a festa every day in Italy, which isn't far from the truth. Every saint gets a day, somewhere, and then there is more. We have been to an escargot feed - they had sausage for non snail lovers. That was Liguria. In Piemonte there was a porcini festival - with polenta. That was free but they asked for donations. This tiny little mountain town.....