announcement
assembly
audience
audio
auditorium
background
blue tone
business
ceremony
chair
communication
conference
conference room
congress
convention
empty
equipment
event
indoors
information
lecture
loud
media
meeting
microphone
news
orator
party
performance
podium
professional
public
report
room
rostrum
seat
seminar
sound
speak
speaker
speech
stage
talk
two
visual
voice