Weddings - The men usually wore quilts or something of their family.

Irish Wedding

St. Patrick's Day Parade - As the stereotypes are right about this. It IS major.

Saint Patricks Day Parade Saint Patrick's Parade

Halloween (AKA Samhain, All Hallows Eve, Hallowmas and Hallowtide) - Yes, it is here. Although, they do also celebrate All Saint's Day and All Soul's Day as well. They go all out for Halloween.

Irish Halloween

Ireland map