I have been organising chess events for over 20 years and lesson number has always been – “Plan the event well in advance“.
I threw out that important piece of advice when I decided on 10th April 2017 that I would organise the 7th edition of the Capablanca Cup to run from 15th to 17th April 2017. A crazy 5 day notice period!! You can see the following story that I did for the event on 7th Capablanca Cup
On the day of the registration deadline I had 6 entries and a few queries only. My gut feeling told me that I was going to end up with a tournament with no more than 24 players.
In the end I had to eat humble pie and do the unthinkable! Postpone the event to another day.
I guess a cartoon illustrates the point in the best possible way!