March 19 or if March 19 falls in Holy (Easter) week the Saturday before sees New Orleans celebrate the Feast of St Joseph. The typical parades have become the modern focal point but old timers all remember the tradition of the St. Joseph altars.
Wikipedia reports:
In New Orleans, Louisiana,
which was a major port of entry for Sicilian immigrants during the late
19th century, the Feast of St. Joseph is a city-wide event. Both public
and private St. Joseph's altars are traditionally built. The altars are
usually open to any visitor who wishes to pay homage. The food is
generally distributed to charity after the altar is dismantled.
There are also parades in honor of St. Joseph and the Italian
population of New Orleans which are similar to the marching clubs and
truck parades of Mardi Gras and St. Patrick's Day.
Tradition in New Orleans also holds that by burying a small statue of
St. Joseph in your yard, your house will sell more promptly. In
addition to the above traditions, some groups of Mardi Gras Indians
stage their last procession of the season on the Sunday prior to St.
Joseph's day otherwise known as "Super Sunday," after which their
costumes are dismantled.