They held a mass meeting.

他们开了个群众大会。

youdao

The workers put up a notice announcing a mass meeting.

工人们贴出了召开群众大会的通告。

youdao

He also maintained the tradition of choosing leaders in a mass meeting, and people under his rule were able to advance by ability rather than noble birth.

他也保持群众大会选举首领的传统，在他统治下的子民均可凭其能力获得晋升，而不是凭其高贵的出身。

youdao

Before the meeting Pope Benedict celebrated a large open-air mass in Valletta, attended by thousands of people.

VOA: standard.2010.04.18

The union is planning at a mass meeting at Hereford Town Hall on Thursday.

BBC: Hereford & Worcester

Another worker at the Southampton factory said a mass meeting had been planned for 1000 GMT.

BBC: Car giant Ford to cut 850 workers

Speakers at a mass meeting in a car park opposite the Lindsey refinery said the demonstrators were standing firm.

BBC: Refinery sackings spark walkouts