meeting.addParticipant(john);
meeting.addParticipant(paul);
meeting.addParticipant(peter);
//the meeting is started
MeetingStartEvent meetingEvent = new MeetingStartEvent(meeting);
meetingsEP.insert(meetingEvent);
//30 minutes later, a call to Paul arrives.
clock.advanceTime(30, TimeUnit.MINUTES);
IncomingCallEvent callEvent = new IncomingCallEvent(paul);