Concepts: member, pitch, staff
A: chat with members of staff on the pitch after the final whistle
Concepts: arrive, event, politician, stage
A: politician arrives on stage during an event .
Concepts: event, excite, student
A: students are excited to have been invited to participate in such a momentous event .
Concepts: demonstrate, equation, work
A:
A man off screen is demonstrating how to work through an equation.