The event has been slammed by official students union bodies.
This picture of one queue – near the Hole in the Wall pub – was posted on a Galway taxi company Twitter feed earlier.
Last year Gardai made a number of arrests.
A Facebook page supporting the event says: “Paint Galway town green & gold for the day, have a good one, look after yourselves and your friends and please drink responsibly”, the page said.
The official Rag Week was done away with in 2011 because of anti-social activity.
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