The billionaire founder of the Blue Origin space company has worked to charm Donald Trump in recent months, and even invited the president to his lavish, star-studded wedding in Venice, White House officials told The Wall Street Journal. The president apparently isn’t planning to attend, due to scheduling conflicts.

Wedding guests have already touched down in Venice, including several members of the Kardashian family and Ivanka Trump.

Amazon founder Jeff Bezos and former journalist Lauren Sanchez are set to tie the knot in Italy this week, even as local frustrations mount over the multi-million dollar event. Here's what to know about the three-day wedding celebration,