May vs Might
First, “might” is the past tense of “may”. So you have to use “might” when you are referring to the past. Use “may” when the outcome is likely and “might” when the outcome is less likely or uncertain. [Examples: (a likely event) I may go to the movies this weekend. (an unlikely event) I might go bunji jumping one day.] But also remember that you use “might” for everything in the past tense. Also, it’s okay to use “might” when you’re writing about negative outcomes, even if they’re likely outcomes, if using “may” would make people think you were talking about having permission. But I would urge you guys not to worry about this last point.