It's a big disappointment to not know anything 5 days before the start. If you have some fixed time windows, which are probably during night or working time for a lot of people, you should give some time to plan accordingly, if you expect any level of participation. It's also disastrous for promotion. "We know there will be this awesome event next weekend, but we don't know what it is." Guess who will take that bait who is not already well connected within the puzzle scene. That's a shame for all the hard work that probably went in.