For a wedding to be among the most expensive, how much would it have to cost (to the nearest whole number) ?

It should cost around $140 million.

Explanation:

When Sheikh Mohammed bin Rashid Al Maktoum married Hind Bint bin Maktoum in 1979, a 20,000-seat stadium was built to accommodate all their invitees. The celebration organized on that occasion presented famous acrobats from Dubai, performances with horses and camels, and Sheikh actually rode to a nearby village on horseback and distributed food to its inhabitants. Extravagance and luxury are no stranger to this celebration, as both the bride and groom are part of the royal family of Dubai. The cost of this wedding when it all came together was $ 137 million. This is the most expensive wedding ever so far.