Convention
Convention or venue will work.
A task force meeting is a gathering of a task force group. A task force is a group of people who come together to work on a single task or objective.
Aside from its main usage as a verb meaning "to come upon or come together," meet also has an archaic, adjectival sense of "fitting, suitable, appropriate."
A non arranged meeting, of which only the people meeting know about. For example; when a politician is meeting a mobster secretly, you could call this a informal meeting! TheFrisian
convention
because they wanted to
To come together, to meet, to hold a meeting, to protest as a group.
of Meet, A coming together; an assembling; as, the meeting of Congress., A junction, crossing, or union; as, the meeting of the roads or of two rivers., A congregation; a collection of people; a convention; as, a large meeting; an harmonius meeting., An assembly for worship; as, to attend meeting on Sunday; -- in England, applied distinctively and disparagingly to the worshiping assemblies of Dissenters.
Market
The noun 'meeting' is a word for:a public gathering of people for a specific purpose;two or more people coming together for a specific purpose;an encounter.
Usually the people meeting convene together physically within a designated area