Have you got info what you'll going to build? Can you prepare a starter project to hit the ground running?

If you have to start from scratch, having built (and documented) a working example helps greatly to get going quickly.

Last, don't forget to take care of yourself, hydrate, bring some food, painkillers, earplugs and so on. Situations like those are stressful enough, easy to rack up a migraine due to dehydration.

Good luck!