To remove the HUD and weapons you must change the GameInfo. Make this:
-Open the Actor Class Browser. Then click on "Info", then go to "GaneInfo", then "TournamentGameInfo" and last select "UTIntro".
-Now go on "View" to choose the LevelProperties. Then you go on "LevelInfo" and select "DefaultGameType". There you click on "use". Now "appears" the before selected "UTIntro" from the Actor Class Browser in the box.
Save the map and when you play the map you have the same screen as in the City-Intro of the normal Unreal Tournament.