It will be held on friday, 11th of April at 11pm Middle European time (I'll poat a conversion once I'm sure when summer time starts in europe).
As for the theme: Bring a musical instrument, or, given their scarcitiy in Valorn, an appropriate noise-maker.
Also, come in full combat gear, as from experience, we expect a raid to happen sometime during the party. Maybe we'll set up some as designated raid-responders.