A tourism official invoked a Trumpian term last week to describe the magnitude of upcoming events in the region.

“Totally huge,” Ed Dombroskas, executive director of the Eastern Regional Tourism District, said of the four-day period that begins June 23, a week from this Thursday.

You’d have to go back to OpSail 2000, he said, to find the last time southeastern Connecticut hotel rooms were as scarce.

Chalk it up to the convergence of two major overlapping events — the Northeast debut of Barrett-Jackson’s collector car auction at Mohegan Sun, which runs June 23-25, and Mystic Seaport’s 25th Annual WoodenBoat Show, which extends from June 24 to 26.

The regional tourism district, which encompasses 42 eastern Connecticut towns and 8,720 hotel rooms, more than a third of them at Foxwoods Resort Casino and Mohegan Sun, says the district’s pretty well booked.

“At this point, if anyone’s looking to participate that weekend and they don’t have lodging, they need to look outside the immediate area,” Dombroskas said. “We’re telling people that the farther south they go, the more availability they’ll find.

“Try Old Saybrook, Westbrook, Clinton, Madison. Going north, there’s the Middletown-Cromwell area.”

Mohegan Sun expects about 50,000 people to attend the Barrett-Jackson auction, which would make it the biggest three-day event the casino has ever hosted, according to Ray Pineault, Mohegan Sun’s president and general manager.

A turnout like that, he said, would recall Billy Joel’s 10-concert run, all sellouts, at Mohegan Sun Arena in 2008.

“Our five-, 10- and 15-year celebrations were big, as was ComiConn (a comic book convention) last year, but what makes this so unique is that it’s the first time this event has ever been done here,” Pineault said.

More than 25,000 tickets have been sold at the Mohegan Sun box office and through Ticketmaster, outstripping the number usually sold in advance of Barrett-Jackson auctions. Typically, Pineault said, same-day sales exceed Barrett-Jackson presales.

The primary market for ticket-buyers ranges from Boston to northern New Jersey and includes pockets in the Rochester, N.Y., and northern New England areas, he said. Buyers hail from as far north as Toronto.

Providing hotel rooms for auction-goers has been an ongoing concern for Mohegan Sun.

The casino’s 1,200 hotel rooms, save for a few set aside for “high-end guests,” sold out in February for the auction weekend.

Since then, the casino has been trying to accommodate player’s club members who still need rooms by contacting other hotels. It's willing to shuttle auction-goers between Mohegan Sun and off-property lodging.

As of Monday, Foxwoods, whose four hotels boast 2,230 rooms, has “a very limited number” of rooms available and has been accepting overflow reservations from Mohegan Sun, a Foxwoods spokeswoman said.

For Mohegan Sun, parking and traffic flow are also priorities.

“We’ve got to make sure that once they arrive, they have a good experience,” Pineault said of auction-goers. “We anticipate that a lot of people coming will be first-time guests.”

The casino’s Winter Garage, closed this past weekend, will remain closed except as a staging area for the hundreds of cars that will be auctioned. The Thames Garage, which has been closed because it hasn’t been needed, will be open the weekend of the auction.

As for staffing, Pineault said, “All hands will be on deck.”

Meanwhile, Mystic Seaport expects about 10,000 people to attend the WoodenBoat Show, roughly the number that have attended in each of the last five years, a spokesman said.

Yankee Magazine’s Travel Guide describes the show as “one of Connecticut’s top 20 events for the summer.”

Dombroskas, the regional tourism director, said there’s been some worry that the run on hotel rooms could scare off tourists.

“We don’t want people getting discouraged that rooms are taken for the whole summer,” he said.

And it's busy here all summer, Robin Grimsley, who owns the Mystic Visitor Information Center in Olde Mistick Village, said. “The (Barrett-Jackson) weekend is one of the busiest but they’re busy all summer long,” she said.

b.hallenbeck@theday.com