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)