Buhari's new wife ceremony
I think there may be some confusion here.
As of my knowledge cutoff, President Muhammadu Buhari of Nigeria is not married to a new wife. He has been married to Aisha Buhari since 1989, and they have been together for over three decades.
It's possible that you may be referring to a different public figure or a fictional event. If you could provide more context or clarify what you're referring to, I'd be happy to try and help you further!