The lineup includes a Saint Patrick's Parade, concerts, free dance and music displays at the centre of the town plus much more.
Crawley's Irish Festival has seen a major from 2006 with a new event added to the August Bank Holiday Weekend.
The Celtic Rock in the Park open air evening concert - aimed at a younger audience.
The first planned concert included the bands Limehouse Lizzy and Emerald Dogs and focused on modern world music with an Irish edge and Celtic Rock.
The Fleadh brings qualified Irish sports (GAA) coaches into local primary and secondary schools for the first time in Crawley's history: it will give children the opportunity to play Gaelic Football and Hurling.