If you want to be ready for a weekly update or event, here some basic tips:
1) Be sure that your Keep & barracks finish their adventure before
2) Have all production buildings on standby to start production
3) Stock pile as much as you can from all basic materials
4) Have some energy backup by hand to enable a quick burst
5) Avoid neighbor requests within the last 24 hours
6) Have 2 buildings of each out and replenished
7) Do not "harvest" buildings with long refresh time (>12 hours)
8) Have crops ready related to the season topics
So if you are a regular player, your can start 1-2 days before to be ready. I may have missed something.