First of all, how many times should the wedding be notified:
Generally speaking, only once, just make sure the other person knows your wedding time and place.
Now the internet is quite developed, most of them use electronic wedding invitations, which are universal and can also put photos of new people. The other party replies to you after receiving the invitation, indicating that the other party has received your message.
If you are an elder and just have time, you can send paper invitations, which is still very ceremonial.
If the distant relative is an old man and neither electronic invitation nor paper invitation works, call or send a text message.
Second, is it ok to get married and have three weddings?
There is only one wedding ceremony, and there is no limit to the number of times you eat.
Generally speaking, a wedding at a man's house is also a wedding of a wedding company. This is a grand ceremony for all the relatives of the man to come back, and the woman will also visit some important relatives.
Before the wedding, the woman's family will invite her relatives and friends to dinner, which is called a wedding reception. As for how big it is, it depends on the meaning of the woman's parents. Who usually receives the gift money and who holds the wedding?
After the wedding, the couple will invite colleagues or friends who didn't come to the old place for dinner.
They are all related to marriage, which can also be understood as three weddings.
Summary:
Notify others to attend the wedding, and be sure that they have received your notice. Receiving the notice means that he already knows. Whether he will come in the end depends on the relationship. There is only one wedding.