Mixing methylphenidate/amphetamine and mushrooms?

[Querjek]

SWIM has a potentially sleepless Friday night and an active Saturday coming up. On Friday night, he and his girlfriend are taking some cocaine at a concert. They'll likely get home around 1 AM because they have to drive 2 hours to get home from the concert. The next morning, they both are going to a science competition and were planning on taking some sort of stimulant because they have to wake up at 4:30 or 5 AM to get to the competition on time (yes, it's ridiculous). Later that day, around 4 or 5 PM, he is getting together with some guys to trip on mushrooms.

1. As far as the stimulant for the next day goes, should they be at all worried about interactions with the previous night's coke?
2. Concerta and Adderall are both available, is one preferable?
3. The effects of the stimulant should have worn off by 5 PM, but should SWIM still be worried about interactions between Adderall or Concerta and shrooms? He's heard they're not too pleasant together.