Very good OP. With some friends a few years ago I started running big parties based on such dates: 09/09/09 in desert outside Broken Hill, Australia (film of this debuting at Shorwave cinema late next year) 10/10/10 in hills outside Melbourne 11/11/11 in 56-bed hunting lodge in mountains outside Sofia, Bulgaria 12/12/12 in London (small affair, about 15 of us) 11/12/13 Peckham Liberal Club, tomorrow. Bands start at 8 sharp. A new algorithm is required as we've run-out of months..