On Thursday, March 16th give thanks to St Urho for driving the grasshoppers from Finland and saving the grape harvest. "Heinäsirkka, Heinäsirkka, mene täältä Hiiteen!" More info about St. Urho can be found here, and over there.
Then, on Friday, March 17th, thank St. Patrick for driving the snakes from Ireland. Here's a little bit of this, that, and the other thing about St. Pat.
Have a safe and happy holiday weekend!