The Celtics may be in Dallas for Games 3 and 4 of the NBA Finals, but it won’t sound like it on Causeway Street when fans pack the TD Garden for the arena’s first-ever watch party.

Ticket prices are soaring on the secondary market after the in-arena watch parties, set for Wednesday and Friday, sold out in a flash last week. Dozens of listings on StubHub were going for well over $150 Tuesday afternoon.

The watch parties will feature the same in-game entertainment festivities as live Celtics home games – concession stands, Lucky the Leprechaun, and in-game fan activations.

When tickets went on sale on Ticketmaster, entry cost $18, with parking at North Station Garage the same price, “to celebrate the Celtics on the road to their 18th championship,” officials said.

Officials also made it clear online that the “resale of tickets above face value for this event is prohibited.”

Some tickets for Game 3 surged past $200 on Stubhub, with the highest at $239 – a listing for the third row in Loge 11, normally right behind the Celtics bench. The lowest went for $46.

More extreme listings were seen for Friday’s Game 4, which could be the championship clincher for the Celtics who look to take a commanding 3-0 series lead Wednesday. The cheapest tickets started at $75, with the most expensive going for $382.

Garden officials turned off the resale function on Ticketmaster “due to the nature of the event,” an arena spokesperson told the Herald.

“StubHub is a marketplace and does not set the prices you see on the site – sellers set the prices,” a company spokesperson told the Herald. “Tickets are unlikely to be sold at unreasonably high prices that do not reflect actual demand.

Filling the Garden with fans when either the Celtics and Bruins are on the road during the Finals or Stanley Cup was a concept arena officials thought about for the past decade, arena President Glen Thornborough told the Herald last week on the parquet.

Bruins CEO Charlie Jacobs and Mayor Michelle Wu pushed the conversation, and Garden officials worked with the Celtics to ensure the feasibility of it all, Thornborugh said. He added the “mimicked version” will require the “same amount of work” as a live home game, with security, concessions, ushers, and other aspects.

Roughly 1,800 tickets were set to be distributed to local charities.

Throughout the playoffs, the Boston Police Department has alerted fans to “be wary of counterfeits when purchasing tickets,” with the latest notification last Wednesday, ahead of Game 1 against the Mavericks.

“It is unfortunate that people are trying to resell them just to go into the Garden to watch the jumbotron,” Celtics super fan Brian Babz told the Herald on Tuesday, “but that’s just the world that we live in where there’s resell. You’ve got to be on top of everything when you do these things nowadays.”

Babz and his friend KJ Green, a Celtics diehard known as ‘Green Runs Deep,’ have organized watch parties at Big Night Live, right outside the Garden, since the 2022 playoff run. He said he “did not sweat” when he learned the Garden would host watch parties since his are open to people 21 and older.

Tickets to Babz’ Finals watch parties cost $20, and the passionate fan said he doesn’t encourage resale but if a need arises, for the prices to stay what they originally went for.

“We’re right there at the TD Garden, it has that same loud atmosphere,” said Babz, whose watch party on Sunday included an appearance from Celtics legend Paul Pierce. “Post-game, what’s great is that right when the game is over, you’re going out with the sea of people coming outside of the Garden.”

Celtics great Paul Pierce gets fans riled up over Causeway Street before Game 2 of the NBA Finals at the TD Garden . (Nancy Lane/Boston Herald)