(MAY 18, 2015)— City officials on Monday questioned leaders from Boston 2024, the nonprofit group eyeing the city for the 2024 Summer Olympics, pressing them for details on their plans.

Rich Davey, Boston 2024 CEO, said the group plans to release the "2.0 version of our plan" in June, focusing on venues and their potential locations in what they say will be a privately financed Olympic Games.

After testifying before a Boston City Council committee, Davey told reporters the group is focused on the Olympic stadium and athlete's village because they're the most complicated and expensive venues.

"As I've mentioned, you know, June is not the end all be all," he said. "It will be Version 2, and we expect to get more public feedback, refine our bid when it's due to the IOC in January, and then we'll have another year to continually refine our bid. So this is a long process to make this bid better."

Gov. Charlie Baker, who is working with Beacon Hill leaders to hire an outside consultant to review a Boston bid, has publicly said he wants details on costs and venues by mid-June.

Appearing on Monday before the Boston City Council's special committee on the Olympics, Davey was joined by International Olympic Committee member Angela Ruggiero; Sara Myerson, executive director of Boston Mayor Marty Walsh's office of Olympic planning; and Walsh's Olympics liaison, John FitzGerald.

Boston City Councilor At-Large Ayanna Pressley and other councilors voiced concerns about the games potentially displacing residents.

Councilor Charles Yancey, who represents Dorchester and Mattapan, said that among his constituents, he has found "very few who are enthusiastic" about the summer Olympics in Boston.

Dorchester Councilor Frank Baker said he wants to support the Olympics. "I can't until we answer some of those financial questions," he said.

Councilor Tito Jackson, who represents Roxbury and Dorchester, pointed to Atlanta, which hosted the 1996 Summer Olympics. He said people were "gentrified out of their neighborhoods."

Adding that the average person in his district makes $34,000 a year, Jackson said, "How does Roxbury stay Roxbury? How does Dorchester stay Dorchester?"

Davey said Boston 2024 has working groups and civic leaders advising them on various topics, including "opportunity and empowerment," as well as ensuring minority-owned businesses get work during the games.

Davey added that the Boston Olympic bid's leadership and Boston 2024's board will soon be adding members. The first round focused on athletes like former Celtics players, but the next round will have more community leaders that reflect the diversity of Boston, he said.

Other councilors were more upbeat about the prospect of the summer Olympics. City Councilor Tim McCarthy, who represents Hyde Park, said he was "excited" about the Olympics.

McCarthy said more information needs to be released about the proposal, to put residents at ease, since the conversation about the Olympics has focused on the games as a "taxpayer burden."

No Boston Olympics, a group opposing the proposal that has met with Beacon Hill leaders, has argued that bringing the Olympics to Boston will cost taxpayer dollars, in addition to money from the federal government for security costs.

Just three months after it releases its "2.0 version," another milestone looms for Boston 2024: September 2015 is the deadline for the U.S. Olympic Committee (USOC) to formally declare to the International Olympic Committee (IOC) that Boston will be the nation's bid city.

Ruggiero, a four-time Olympian and a member of the IOC as well as the Boston 2024 Board of Directors, told councilors the USOC is currently in the "vetting process" to ensure Boston is the right city, but there is "no guarantee" Boston will get the nod in September.

"We want Boston to succeed," she said.

Boston is expected to officially learn its competitor cities, which will likely include Hamburg, Rome, Paris and Budapest. About 100 IOC members will be voting in the competition, which will be decided in 2017, according to Ruggiero.

"Boston I think is at the point where there's this little dream happening and Boston 2024 is trying to communicate that dream," she said.

City Council President Bill Linehan, who chairs the special Olympic committee, appeared impressed by Ruggiero, a Gold medalist, appearing alongside Boston 2024 and Walsh administration officials to promote their bid.

"I was expecting a 75-year-old guy," Linehan said.

Speaking to reporters after his testimony, Davey said Red Sox chief executive Larry Lucchino and businessman Jack Connors are expected to get involved.

"In Phase 1 we had a great team, in Phase 2 we are casting our net even wider for help and assistance," he said.

Former Gov. Mitt Romney, who helped run the 2002 Winter Games in Salt Lake City, is an "occasional adviser," according to Davey.

At the hearing, Boston 2024 officials said they remain undecided on whether they will gather signatures for their proposal or work with the Legislature to pass a law putting a question on the 2015 statewide ballot.

"Still open, I think, for discussion," Davey said.

When Boston 2024 announced its support for a referendum seven weeks ago, the group said it would be gathering signatures. But later in March, during a radio appearance, Baker said he hoped to work with House and Senate lawmakers to create the language for the ballot, opening the door to avoiding signature-gathering efforts.

Davey reiterated that Boston 2024 will abide by both a statewide and citywide results of a referendum on the 2024 Summer Olympics, and pull the bid if voters reject the ballot question.

If Boston 2024 attempts to gather signatures, the group faces an Aug. 5 deadline to submit proposed ballot language.

If the language is approved by the state attorney general, the group will then have to embark on an effort to gather tens of thousands of additional signatures.

The City Council's special Olympics committee plans future hearings on the financing of operations and venue development, as well as Back Bay Councilor Josh Zakim's push for a non-binding public opinion referendum to be placed on Boston's 2015 municipal ballot in November.