Well, I just came from the Cathedral of Mary Our Queen in Baltimore, MD. I have to confess that I bought some Mercy memorabilia but did not participate in prayer becuase I was in a bit of a rush. But, I did here the music which was beautiful.
It was fitting that the Pope passed before Mercy Sunday. He canonize St. Faustina, a fellow Pole and great woman, who had the revelations from Jesus concerning Mercy. The Pope also promoted this devotion.

Jam 2:13 For he shall have judgment without mercy, that hath shewed no mercy; and mercy rejoiceth against judgment.