Ok, for the game, this is the set-up (right click, copy image location and paste it into your browser for a clearer version - images are shrunk on this board):
The last rule is the one that yields the important inferences. It tells us that P and R cannot
be held until the day after the second workshop on lighting is held. Immediately, then, we know that P and R cannot be on Monday or Tuesday - the earliest possible time they could be held while satisfying this rule is Wednesday. Since there are now three days left, Wednesday, Thursday, and Friday, P and R, individually, have only two placement options - either Wednesday, Thursday or Thursday, Friday. Since Thursday is common to both options, we know for sure that they will both be held on Thursday. Whether or not one or the other is held on Wednesday or Friday is still unknown.
Likewise, since P and R must be on Thursday and must be held after
the last workshop for L (lighting), we know that L has two options - it is either held on Monday and Tuesday or Tuesday and Wednesday. Since Tuesday is common to both, it is definitely on Tuesday.
The first rule says that a maximum of two workshops are held on each day. Thus, S cannot be on Thursday. Since the workshops must be consecutive, that means S cannot be on Friday either. So S is either on Monday and Tuesday or Tuesday and Wednesday, like L. That means we can put S into Tuesday for sure as well.
Note also that since at least one workshop must be held each day, P or R or both must be held on Friday.
Here, there are still a number of options but this is probably sufficient to move through the questions.
8. We know immediately a) is wrong. b) is not obviously wrong so keep it. c) is obviously wrong from the set-up. Same with D. E) is wrong because if both P and R are on Wednesday nothing is left for Friday.
That leaves b as the right answer.
9. a) is obviously wrong from the set-up. Same with b). c) sounds plausible, keep it. d) is clearly wrong. e) violates that all important last rule that says the earliest P can begin is on the day immediately following L's second session.
You're left with c.
10. a) is the right answer, saving you work. If P is on Wednesday, that means L must have finished on Tuesday, meaning its first session had to have been on Monday.
11. Again, a) is right. If P is the only workshop on Friday, that means R must be on Wednesday and Thursday and not Thursday and Friday. If R is on Wednesday, L must be on Tuesday and Monday. Thus, L being in session on both Tuesday and Wednesday must be false.
12. If L is the only session on Monday, that means S must be on Tuesday and Wednesday. a) is wrong; can't have R on Tuesday regardless. b) is wrong; S must be on Wednesday. c) is not immediately wrong, keep it. d) we know is wrong; P and R are always on Thursday and you can only have two workshops per day. e) is wrong for the same reason; S cannot be on Thursday.
You're left with C.