After reading the above thoughts posted by Lance on the USA MC thread, I changed the title of the planning thread, from its previous NYC-focused title.
I was thinking, at the same instant as the informal competition starts in NYC, we can post-online the same number-lists and card-sequences being memorized by the contestants. Then anyone anywhere can compete at the same time and their results can be automatically posted, as well as shared at the physical event. So while the somewhat-carefully organized in-person NYC event will certainly have its own leaderboard, we can have a parallel public leaderboard accessible to anyone to self-report their scores on the same numbers. I expect this will encourage all concerned!