Ohio Poetry Day is celebrated on the third Friday and Saturday of October. From the page, I see that "Ohio Poetry Day was the first government sanctioned Poetry Day in the United States. It was through this day that other states began to celebrate a poetry Day and eventually National Poetry Month came to be."
The poetry day celebration includes the Friday evening "poets meet and greet," followed by the poets heading to Carmie's for an open mike and other amusements, but the main event on Saturday (October 15), with readings from the Ohio poet of the year, awards to the poets who won the Ohio Poetry Day contests (followed by readings), and various other readings and poetry events; not to mention the book room. The events finish up at 5, except for the after party.
Check the website at ohiopoetryday.org for more, and read the Ohio Poetry Day forum if you want to comment, ask questions, or get the most up-to-date information.
If you're on Facebook, check out the Ohio Poetry Association group.
--by the way, this year's winners of the 2010 Ohio Poetry Day contest includes a good sampling of area poets. Just noticing the names who contribute to clevelandpoetics, I see T.M. Gottl, Mary A. Turzillo, Geoffrey A. Landis (um, that would be me), Dianne Borsenik, and Joshua Gage. Congrats, poets!