Edit: I just noticed that you were asking about the Millions Missing event but didn't realize when I first read your post. I don't know the date but usually it is held at many different locations/countries across the world.
sorry brain is unplugged, yes I was hoping to find out when the millions missing would happen and where. I thought that it was held in one place one time but from what you wrote I was wrong.
who organizes it or how do they happen if its not a regular thing? i would love to try to participate help or support it if I could,