The Joker would not invited.
His butler, Alfred Pennyworth, would be invited.
Joker
He would know all the same people he knew before he got married.
If Batman got married, it's likely that the Joker would not receive an invitation. Their tumultuous and adversarial relationship makes it clear that Batman would want to avoid any chaos or disruption on his special day. Additionally, inviting someone like the Joker could lead to unexpected and dangerous situations, which Batman would surely want to avoid.
He is a fictional character and this is not possible.
cat women, penguin, joker, bane
Any one of the rogue gallery would not get an invitation, but if you were to choose, highest on that list would be the Joker.
his sidekick
The Marvel superheros and the villains.
Most people would not get an invention. Inventions are few and far between even among fictional super heroes.
It is not expected but it would be nice to do so.
you and any norrmal citizon also anyone he is an enemy of