I suggest that on June 16th of every year (or a date approved by CBS) that we celebrate Captains' Day in STO.
The lore would be that the crew and children of the Enterprise D carried the idea of Captain Picard day to other ships, where it caught on and eventually became celebrated fleet-wide. Eventually, it was formally adopted as a holiday to celebrate those Starfleet Captains who have made a significant impact on life within the Federation (much like the USA's Presidents' Day).
The festivities themselves would involve references to the Captains of canon history and any soft-canon characters that fit into the STO timeline.
As for the Klingons, Worf may have encouraged the Empire to have their own Day of Songs that coincides with Captains' Day.
U.S.S. Marathon - NX-392781
Joined: August 11, 2008