While St. Patrick's Day isn't until Monday, Chicago's iconic tradition dyeing the river green is happening Saturday. Here is how to watch the event.

Colouring the Chicago River ahead of St. Patrick's Day celebrations has been a tradition of 63 years now. The dyeing immediately precedes the annual downtown St. Patrick's Day parade. The dye is nontoxic. While the river stays bright for several hours, some trace of color can remain for days.

The Chicago River is once again glowing kelly green as the city opens its annual St. Patrick’s Day celebrations