Plan: February 23 and 24 is World Pentax Day
Oppa K-style! Mark your K-calendars! February 23 and 24 in 2013 is going to be the next Pentax World Day. Details, festivities, galleries from previous years, email alerts and more can be found via the Pentax Forums News blog.
I do not know if Ricoh cameras are eligible now that Pentax and Ricoh are one item. The post says rebadged Pentax clones are eligible (eg the Samsung K-mount DSLRs before they started the NX mirrorless system).
If you are considering a Pentax camera so you can participate in the event, be sure to check the list of completed Pentax camera reviews. Only the interchangeable lens Pentax cameras are tracked in the review lists since Pentax hasn't made a serious Optio since the 750s. The MX-1 has not been released yet, so it doesn't have completed reviews.
If Ricoh cameras are eligible, here is a list of completed Ricoh camera reviews.