Thank you all for the answers. Yesterday my mother has received an invitation for both of us, they gave it personally, without any apologies. The wedding will be thematic, with the costumes that we haven't. So we decided that just go to the official registration to give to a new couple a check and flowers and to wish them happiness. I'm still feeling upset, but now I know that it's justified. Thank you again, I appreciate your help.

I was invited by telephone, in words through my mother. As I said, three days before the event. But I think it's disrespectful at least. I do not even have time to buy clothes and gift. But I'm not sure, am I too proud in this situation?