Might or May?
Might & May can usually be interchanged without a significant difference in meaning.
However, might implies a smaller chance of happening, when you express the possibility.
It may rain -> ca. 70% chance
It might rain -> ca. 40% chance
Remember, when you express wishes or give permission - use only may.
Possibility -> It might rain in the afternoon, so take an umbrella.
Give permission -> You may have another beer if you like.
Ask for permission -> May I borrow your book?
Express wishes -> May the Christmas bring you happiness?