Hmm, I'm willing to bet Runesinger knows a thing or two about that one, seeing as it's a Norwegian festival and in her neck of the woods.
Are you talking about the Heathen drinkingfest? (Well, drinkgelag translates to 'orgy' in my dictionary... but I'm not sure I'd be so down with that ) That's the only thing even remotely resembling what you were talking about, that I could find.