To participate, simply make at least one of your LJ entries on Wednesday a poll. Any type, drop down, text entry, radio or check. Any subject of your choice. Any number of questions from 1 to 1000 (but I seem to recall that there is a limit of 20 questions). Of course it would be more successful if you pimp International LJ Poll day to your Flisters too, so that would mean that going to Friend of Friend would provide a selection of LJ Polls too see? And the joy of filling in LJ polls will touch more people.
Of course you could just ignore the whole thing for some floaty snowflakey objectional reasons like "OMGZ I am allergic to LJ POllzz" or some bollocks.