academic
assembly
audience
black and white
business
businessman
co operation
committee
conference
congress
convention
convention center
cooperation
corporate
council
development
economic
education
election
event
gesturing
group
institute
lecture
lecture hall
lecturer
listeners
manager
meeting
organisation
party
people
presentation
professional
proletariat
public
retro
seminar
sepia
sitting
speaker
speech
staff
trade union
training
union
university
vintage
workers
working class