If I had known about their wedding plan earlier, I would have been able to make time to attend the reception party.
I knew their wedding would be planned earlier so I made some time to attend the reception party.
I wish I had known their wedding plan earlier so that I could arrange time to attend the reception party.
I don't know their wedding plan earlier so I can't make time to attend the reception party.
When I knew their wedding party, it was too late to attend the reception party.