I don't see anyone of us agreeing that 5 notices for 1 event is justified. We try to do as little as possible, which makes for 2x3 in a span of 1,5 to 2 hours. If there are people who think this is too much, please consider the fact that there are people who actually read the notices and use them to participate in events. I highly doubt having 6 messages showing up in 1,5 hours is even slightly annoying at all.