"joined at the table" is correct and usable in written English.
You can use it when describing a scene in which two or more people are physically gathered together around a table. For example: The family gathered in the dining room and were soon joined at the table by their long lost uncle.
Union officials were joined at the table on Monday by the Boston Celtics' Paul Pierce, who has become notably active in the last few days.
And the mayor — who dropped off his election petitions at City Hall last month wearing shorts and a Panama hat — said he was not happy to be joined at the table by a gaggle of reporters.
We're joined at the table by three of Rostron's friends and collaborators: bandmate Hermione Frank (who also makes minimal house music as rRoxymore), techno producer Paula Temple and Tunisian musician Houwaida Hedfi.
The administration decided in recent weeks to attend the conference, but in an effort to avoid the spotlight it ensured that it will be joined at the table in March by other permanent members of the U.N. Security Council, U.S. officials said.
We were joined at the table by Dick Keil, a former White House reporter for Bloomberg News who now works for a media consulting company called Purple Strategies, which was co-founded by Steve McMahon, a Democratic strategist/TV pundit/friend of Ted Jr.'s from the old days, when he worked on Ted Sr.'s 1980 presidential campaign.
He was joined at the witness table by J. Russell George, the Treasury inspector general for tax administration, and Treasury Deputy Secretary Neal Wolin.
Because of our diplomatic efforts, the world stood with us, and we were joined at the negotiating table by the world's major powers: the United Kingdom, France, Germany, Russia and China as well as the European Union.
Mr. Hanley, joined at the bargaining table by Schools Chancellor Harold O. Levy, presented the city's opening proposals nearly three months after the teachers presented their opening proposals at the first negotiating session.
Over the next 35 years or so, the populations of the world's wealthiest nations are expected to be joined at the banquet table by the growing populations of countries undergoing rapid development.
Emphasizing the importance of technology to his country and and his visit, Xi was joined at the head table by Bill and Melinda Gates, Microsoft Chief Executive Satya Nadella, Qualcomm head Steve Mollenkopf and Lu Wei, China's cyberspace czar.
Or a call to all peoples to join at the hummus table.
