"extraordinary assembly" is correct and usable in written English.
It can be used to refer to a meeting or gathering which is out of the ordinary or not a regular event. For example, "The mayor announced an extraordinary assembly to discuss the budget crisis".
An extraordinary assembly of the Writers' Union was scheduled for the following week.
The popularity of The Expendables, though, was rooted not so much in its action sequences as the familiarity of the stars themselves and their extraordinary assembly in one story.
During an extraordinary assembly of the OAS in September 2014 in Guatemala, the hemisphere approved a joint resolution that marked the beginning of a new phase in the regional approach to counter the challenges posed by the world drug problem.
Mr. Miller's pitch to Mr. Pruitt became a reality early last year at the historic Skirvin Hilton Hotel in Oklahoma City, where he brought together an extraordinary assembly of energy industry power brokers and attorneys general from nine states for what he called the Summit on Federalism and the Future of Fossil Fuels.
2. SWEPT AWAY -- Among the museum exhibitions whose visual inundations left one feeling shaken and recharged were the Met's extraordinary assembly of Renaissance tapestries; the Sackler's revelatory show of Chola bronzes in Washington; and the Pompidou's out-size Surrealist survey in Paris, where the paintings never stopped.
The International Print Center, a space for graphic arts, has just closed a major show of Brazilian printmaking, and Broadway 1602 is presenting what I'd call the city's best gallery show of the year so far: "Ultrapassado," an extraordinary assembly of ten female artists – five Brazilian, five from elsewhere – whose art has been inspired by Clark and other figures of Brazilian modernism.
Like Beuys, Polke created extraordinary assemblies of the most ordinary materials, which also appeared in his collages and paintings: at one point he developed a particular penchant for liverwurst and potato that culminated in 1967 with Potato House, a remarkable flat-pack installation.
In late 1947, Seretse returned to Bechuanaland to seek ratification of his marriage from his tribe: at an extraordinary tribe assembly, thousands of men stood up in a dramatic show of support for their future Chief.
But an extraordinary general assembly of the federation went ahead in Abuja on Saturday despite Fifa's warning of a possible suspension for the West African country if it did not restore the old leadership to power.
An extraordinary general assembly of the federation went ahead in Abuja on Saturday, which voted out the NFF leadership who have been accused of derailing the country's World Cup campaign in Brazil, despite Fifa's warning of a possible suspension.
