adult
attention
attentive
audience
auditorium
backs
blur
business
busy
coaching
colorful
conference
congress
crowd
event
female
foreground
forum
group
hall
indoors
information
interested
knowledge
learn
lecture
lecturer
listeners
listening
male
man
many
meeting
men
participants
people
person
presentation
public
rear
room
row
seated
seminar
sit
speaker
training
view
watching
woman