How do I make an Intermission?

I want to make an GUI intermission at the beginning of a game, then when it strikes 0, all players get teleported to a certain area. Similar to stickmasterluke's "Deception Infection" , loleris's "The Mad Murderer" , etc.

This is not a request site.

Try yourself first, we are here to HELP you fix your code if you have problems, not do the work for you.

If you are looking for help on where to get started doing it yourself, rephrase your question.