KDF captains can head to the borders of the Sirius Sector Block from any adjoining sector and receive special permission to warp directly to the Risa system. Once you arrive, beam down to the planet and join the party!
It hasn't started yet. Most likely it'll be just like the Q weekends or the last two winter events and it'll actually start around 10:05-10:10, not 10:00. Edit: Beam down enabled about a minute after I posted this, so 10:03. Ahead of the usual time for these things.