A typical preparation and execution cast will look something like this:

Pre-cast
Research tournament
Research teams and players
Prepare interview/monologue/storyline/intro
Communicate with co-caster
Intro-cast
Welcome everyone
Introduce event
Introduce the production team
Explain rules of the tournament
Discuss schedule
Plug any additional info i.e. secondary streams
Discuss brackets
Introduce the teams and the players
Between-maps
Analyse logs
Reintroduce into new map
Aftermath-cast
Interview players
Shoutouts
Thank everyone
Plug twitter
Plug facebook
Plug Twitch follow
Plug youtube
Plug Discord
Plug website