CNN reported that Wisconsin Rep. Paul Ryan and New Jersey Gov. Chris Christie, who are both potential presidential candidates, are expected to attend the event, though the senior official said no speakers are confirmed.
Romney sent invites on Friday to his national finance team that raised cash for his presidential bid as well as to investors in the Solamere Group, founded by son Tagg Romney and Salt Lake City native Spencer Zwick.
"As we only have capacity for a small group of people to be part of this gathering, invitations will be kept to a limited group of industry and thought leaders," reads the invite, signed simply, "Mitt."
Romney had promised to stay in touch with his finance team after his losing White House bid, and this event is an opportunity to engage with them, the senior adviser said.
Attendees are asked to donate $5,000 for the gathering, though the senior adviser said that money will go toward the cost of space rental, meals and travel, and not to any political cause.
Romney, the former head of the 2002 Winter Olympics in Salt Lake City, held an event in Park City last year for major donors and strategists as he sought the presidency. He sold his Deer Valley home in 2009.