Be careful with your diagramming of "unless" rules! This is something that is addressed in Chapter 3, under "Rule Representation," where we discuss the "Unless Equation."
Go back and check out that discussion, and the rules for dealing with "unless" in conditional statements.
The first step of the Unless Equation is to diagram the part of the rule modified by unless as the necessary condition
. Here, Hancock performing on Saturday is modified by unless, so it becomes the necessary condition (on the right side of the arrow), per below:
The second step of the Unless Equation is to negate
(i.e., state the logical opposite of) the remaining condition, then diagram it on the sufficient side of the arrow. Here, the remaining condition is "Fine cannot perform on Saturday," so we need to negate that to "Fine can (i.e. does) perform on Saturday" then diagram that on the sufficient side of the arrow, per below:
Now we're home free, with the accurate diagram!
The reason this more complex diagramming procedure is required is because of the nature of "unless" statements, which are speaking about exceptions to a normal situation. In this game the normal situation is that Fine cannot perform on Saturday. The exception to that (the necessary circumstance in which Fine CAN perform on Saturday) is when H performs on Saturday. In other words, if the exception (Fine on Saturday) is going to occur, then it MUST be the case that H performs on Saturday. Since the unless statement speaks to that exception (Fine performing on Saturday) our diagram has to reflect that, and it has to reflect that what is necessary for that exception to occur is the "unless" condition (H performing on Saturday). Hence, the Unless Equation above, which gets us to the right logical diagram!
I hope this helps!