Raleigh's St. Patrick's Parade along Fayetteville & Blount Streets, and the following festival in Moore Square, is a real treat. One of the best day-long outdoor events in the area, IMO. Music, dancing, drinking, food, crafts, etc....they usually have something for everyone. And the parade is definitely very inclusive...not just Irish groups but anyone who wants to join. There's usually a German band, some Scandinavian "Vikings", the Rennaissance Faire Group, Scottish bagpipes, and so forth.
The nearby Exploris Museum usually has some Irish-related events that day, too. And the NC Museum of Science will be "green" with Reptile/Amphibian Day.
Check the parade & festival out at
www.raleighstpats.org to see the events and times.