My night of questions!

So, in my budget, I have a small and simple two-tier cake + cupcakes priced out. I like the idea of cupcakes more than sheet cake because I can have them on display, and personally I like to eat with my hands. And I want to have the small two-tier cake because I like the tradition of cake cutting.
Here's my question, how does this work logistically? "Hey if you want a cupcake grab one, but we don't have enough slices of cake if everyone wants slices?" Also, do we cut the entire cake or send it back to the kitchen to be cut?
I know this "issue" hardly matters, but I'd like to hear other people's experiences/opinions.

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