St. Patrick Day -- Will it be the busiest day for bars?

Here's an interesting article in which a not-particularly-Irish bartender (Dave Wiganowsky, of Wiggies bar in Madison WI) cites St. Patrick's Day (March 17th) as the busiest day for his bar.

I'm still looking for other sources to confirm that St. Patrick's Day is the single busiest day of the year for bars and for alcohol consumed in licensed establishments.

I suspect that there are bigger beer drinking days, like Memorial, Independence, or Labor Day, and bigger wine/Champaign days, like New Years, and that much of the alcohol on those days is consumed at home or, at least, not in a bar.