In fact, my submission is still "open" but it's not included in the schedule. However, I got to the conclusion that it had been rejected when I didn't get any message at all. As Cooper says, this is something that future organizers may have to take into account. In other Wikimanias (this is my fifth) I remember having received a message stating that my submission had been accepted. But, as this is the first time that it's not, I thought that only successful candidates received messages. It's good to know that.