Brent St Patrick's Day Parade
Time Out says
A parade, from Willesden Green tube to Willesden Green Library Centre, featuring floats, pipers and costumed dancers kicks off at 4pm. Plus live music and dance on a stage in front of the library, an Irish market and children's activities such as circus skills workshops and face painting. The parade takes place on St Patrick's Day rather than the nearest weekend, in an area with a significant Irish population.
For more St Patrick's Day events and pubs see http://www.timeout.com/st-patricks-day/