The Best Time
The best time to start preparing for that big show, that important writers round, that studio day, is 3-5 years ago.
The second best time is 3-6 months ago.
If it’s the day before the gig, you’re either ready or you’re not. Cramming might help a little, but it’s unlikely.
Your time is probably better spent having you show up in the best mood.
Relaxed, receptive, and ready to have the best time, no matter what happens.
The best thing to do the day before the gig, might be figuring out strategy for preparing next time.