What do three out of the four mitzvos on Purim have in common?

They bring people together.

Moshe's name isn't mentioned in the parsha to teach us a very powerful lesson.

Why do the Kohanim need to wear certain clothes? Could they not just wear simple clothes?

No, they can't. What you wear defines you.

When everyone gives the same half of a shekel, it means that no one is bigger or better than anyone else.

And when that happens, it makes everyone happy.

The Kruvim represents two people learning. But not just any two people. Two children. Perhaps to signify how one needs to approach learning.

How do we feel the inspiration we once had when the Beis Hamikdash was around?

Go to the shuls and Batei Midrashim, places where spirituality reigns, and see people to look up to.

The Vilna Gaon illuminates our eyes as to why the pasuk isn't to be taken literally.

Shavous seems to have more significance than due to Matan Torah.

The Parsha talks about a lot of halachos that we have between people. Do these pertain to between a Jew and a non-jew? Certainly not.

Should one wake up a parent for them to gain? A machlokes amongst modern-day poskim.