"Coach, when is the meet going to end?" "Coach, when is my event?" "Coach, you want me to run WHAT?!?!?"
Track and Field competitions are a very fluid and dynamic event. Some meets will end an hour ahead of posted times and others will end an hour after posted times. There is no way to predict how many athletes will be participating in each event, how efficient the timers and starter may be, the impact that the weather or an injury might have on the timing of the meet, etc. There are no quarters, periods, frames, or innings. There are very few times where a meet starts and stops at the exact posted time. There are very few times where the line-up posted before a meet is the exact line-up run during the meet.
As a team, we will put each athlete in the best possible place to reach our team and individual goals...you might be asked to step into a race in support of an injured or ill teammate. Support that teammate, step up. You might be asked to do a different series of events than you are used to. We are trying to maximize points and opportunities for the whole team. Support the team, step up.
Please be aware that changes always happen during a meet. Please be flexible in your understanding of that. The key to that understanding and flexibility is communication.