8. On brewday + 15, bottle with sugar to reach a CO2 level of 2.4 volumes
9. On brewday + 20, deliver bottles and let them be stored Saint Arnoldus knows where
You run the risk of only allowing 5 days for carbonating in the bottle if Saint Arnoldus decides to store them cold. That has the potential to leave a mostly flat beer - and from the perspective of hop aroma and rewarding drinking experience, that would be a killer. Maybe you can request they be stored out of the fridge?
Good point. Or you can contact the organizer and ask them how they will be stored (basement, fridge, etc). If you really want them carbed up fast you may also want to consider adding some rehydrated dried yeast (I like champagne yeast for this) to your bottling bucket which (if kept warm, i.e. 75-80F) will help the bottles carbonate in under a week. I have done this before in the past when a comp is coming up quickly and need the bottles to carbonate in a shorter period of time. Not the best route, but effective.
As for gelatin, here is a tried and true method that will work every time.
1. Boil 350 mL distilled water for 5 min in small saucepan with lid on towards end to sanitize.
2. let cool to around 150F, checking with sanitized thermometer.
3. Add 1 tsp gelatin and put lid back on. Let rest for 10 min to bloom.
4. Gently swirl and pour into chilled fermenter/beer. I add it to bottom of the keg prior to racking cold beer on top. I give it a gentle shake to be sure it is all mixed well. Then keg goes into fridge for a few days while carbonating and BLAMO! Clear beer.