It seems to be a Jewish custom (even great Rabbis do it) to invite people to at least weddings (maybe also bar mitzvah (but maybe not to a bris)

What is the idea of this invitation?
Is it a command telling them to come?
Is it a request asking for them to come?
Is it not a request but only informing them that if they want to come they can (and without an invitation you cannot come)?
(The word Hazmana (invitation) is also used when the court askes someone to come to court)

Are here halachik reasons to invite people? (What are they?)
(Is it to help your bride to respect you (so many people come to respect my groom - he is important), as by the mitzvah of hachnosas kalla)

Is it improper not to invite anyone to a wedding (if you will have 10 men there anyway)...? Why?

If someone was invited can he not come?
Is it disrespectful to invite important people (you tell them what to do)?

If the one inviting going a favor (of inviting) to the one being invited or visa versa (of coming), it is important to know so to avoid being an ingrate

I am interested in "what is invitation?".

The above questions are only to help someone give a more full answer (partial answers still appreciated)

closed as too broad by mevaqesh, Gershon Gold, mbloch, sabbahillel, DonielF Oct 18 '17 at 14:48

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    Invitations to events is a universal social convention, whose utility is evident. Why would you assume there is anything distinctly Jewish about it? Will you similarly ask if there is a Jewish source for the practice of millions of Jews to drive automobiles? – mevaqesh Oct 17 '17 at 17:37
  • @mevaqesh it is not evident to me (a klutz) , but what you claim is an answer by itself – hazoriz Oct 17 '17 at 17:39
  • @mevaqesh so I guess I should also ask this (or maybe first ask this by interpersonal.stackexchange.com ) – hazoriz Oct 17 '17 at 17:42
  • These days, the "invitation" is becoming more like an announcement. More of it is being done online with tools like e-vite. Even if you get a personal email, and even it says, "you're invited", it's, technically an "announcement" (we can debate on semantics.) Point is - if you don't get one of these, how are you supposed to know the event will occur and, more importantly, how would you know if the host cares for your presence (and presents)? – DanF Oct 17 '17 at 18:15
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    You mean "orally" - by speech or using the mouth. "Aurally" means using the ears. Funny thing is that they are pronounced alike and sound alike. Go figure! – DanF Oct 17 '17 at 21:08