To add a bit of "flavor".  Order 66 event could be similar to the one in raw:
 
</Event>
 <!--Order 66 -->
 <Event Name="Execute_Order66_Pause">
  <Event_Type>STORY_ELAPSED</Event_Type>
  <Event_Param1>30</Event_Param1>
  <Reward_Type>PAUSE_GALACTIC</Reward_Type>
  <Prereq>Empire_Enters_Tech_05</Prereq>
 </Event>
 
 <Event Name="Execute_Order66">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>MULTIMEDIA</Reward_Type>
  <Reward_Param1>TEXT_SPEECH_REPUBLIC_ORDER66</Reward_Param1>
  <Reward_Param2>-1</Reward_Param2>
  <Reward_Param8>REPUBLIC_ORDER66</Reward_Param8>
  <Reward_Param9>Emperor_Loop</Reward_Param9>
  <Reward_Param10>1</Reward_Param10>
  <Prereq>Execute_Order66_Pause</Prereq>
</Event>
 
<Event Name="Execute_Order66_Stop_Text">
  <!--Stop Text-->
  <Event_Type>STORY_SPEECH_DONE</Event_Type>
  <Event_Param1>REPUBLIC_ORDER66</Event_Param1>
  <Reward_Type>SCREEN_TEXT</Reward_Type>
  <Reward_Param1>TEXT_SPEECH_REPUBLIC_ORDER66</Reward_Param1>
  <Reward_Param4>remove</Reward_Param4>
  <Prereq>Execute_Order66</Prereq>
</Event>
<Event Name="Execute_Order66_Stop_Loop">
  <!--Stop Loop-->
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>STOP_COMMANDBAR_MOVIE</Reward_Type>
  <Prereq>Execute_Order66_Stop_Text</Prereq>
</Event>
 
<Event Name="Order_66_Montage_Movie">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>START_MOVIE</Reward_Type>
  <Reward_Param1>Order66_Montage</Reward_Param1>
  <Prereq>Execute_Order66_Stop_Loop</Prereq>
</Event>
<Event Name="Order_66_Montage_End">
  <Event_Type>STORY_MOVIE_DONE</Event_Type>
  <Reward_Type>UNPAUSE_GALACTIC</Reward_Type>
  <Prereq>Order_66_Montage_Movie</Prereq>
</Event>
 
<Event Name="Jedi_Purge_Remove_Mace_Windu">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>REMOVE_UNIT</Reward_Type>
  <Reward_Param1>Mace_Windu</Reward_Param1>
  <Prereq>Order_66_Montage_End</Prereq>
</Event>
 
<Event Name="Jedi_Purge_Remove_Plokoon">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>REMOVE_UNIT</Reward_Type>
  <Reward_Param1>Plokoon</Reward_Param1>
  <Prereq>Jedi_Purge_Remove_Mace_Windu</Prereq>
</Event>
 
<Event Name="Jedi_Purge_Remove_Obiwan">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>REMOVE_UNIT</Reward_Type>
  <Reward_Param1>Obiwan</Reward_Param1>
  <Prereq>Jedi_Purge_Remove_Plokoon</Prereq>
</Event>
 
<Event Name="Jedi_Purge_Remove_Aayla">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>REMOVE_UNIT</Reward_Type>
  <Reward_Param1>Aayla_Secura</Reward_Param1>
  <Prereq>Jedi_Purge_Remove_Obiwan</Prereq>
</Event>
 
<Event Name="Lock_Aayla">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>LOCK_UNIT</Reward_Type>
  <Reward_Param1>Aayla_Secura_Team</Reward_Param1>
  <Prereq>Jedi_Purge_Remove_Obiwan</Prereq>
</Event>
 
<Event Name="Jedi_Purge_Remove_Barris">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>REMOVE_UNIT</Reward_Type>
  <Reward_Param1>Barris_Offee</Reward_Param1>
  <Prereq>Jedi_Purge_Remove_Aayla</Prereq>
</Event>
 
<Event Name="Lock_Barris">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>LOCK_UNIT</Reward_Type>
  <Reward_Param1>Barris_Offee_Team</Reward_Param1>
  <Prereq>Jedi_Purge_Remove_Aayla</Prereq>
</Event>
 
<Event Name="Jedi_Purge_Remove_Luminara">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>REMOVE_UNIT</Reward_Type>
  <Reward_Param1>Luminara_Unduli</Reward_Param1>
  <Prereq>Jedi_Purge_Remove_Barris</Prereq>
</Event>
 
<Event Name="Lock_Luminara">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>LOCK_UNIT</Reward_Type>
  <Reward_Param1>Luminara_Team</Reward_Param1>
  <Prereq>Jedi_Purge_Remove_Barris</Prereq>
</Event>
 
<Event Name="Jedi_Purge_Remove_Shaakti">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>REMOVE_UNIT</Reward_Type>
  <Reward_Param1>Shaak_Ti</Reward_Param1>
  <Prereq>Jedi_Purge_Remove_Luminara</Prereq>
</Event>
 
<Event Name="Lock_Shaakti">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>LOCK_UNIT</Reward_Type>
  <Reward_Param1>Shaak_Ti_Team</Reward_Param1>
  <Prereq>Jedi_Purge_Remove_Luminara</Prereq>
</Event>
 
<Event Name="Jedi_Purge_Remove_Yoda">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>REMOVE_UNIT</Reward_Type>
  <Reward_Param1>Yoda</Reward_Param1>
  <Prereq>Jedi_Purge_Remove_Shaakti</Prereq>
</Event>
 
<Event Name="The_New_Order_Begins">
  <Event_Type>STORY_ELAPSED</Event_Type>
  <Event_Param1>5</Event_Param1>
  <Prereq>Jedi_Purge_Remove_Yoda</Prereq>
</Event>
 
<Event Name="The_New_Order_Remove_Palpatine">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>REMOVE_UNIT</Reward_Type>
  <Reward_Param1>Chancellor_Palpatine</Reward_Param1>
  <Prereq>The_New_Order_Begins</Prereq>
</Event>
 
<Event Name="The_New_Order_Spawn_Palpatine">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>SPAWN_HERO</Reward_Type>
  <Reward_Param1>Emperor_Palpatine_Team</Reward_Param1>
  <Reward_Param2>Coruscant</Reward_Param2>
  <Prereq>The_New_Order_Remove_Palpatine</Prereq>
</Event>
 
<Event Name="The_New_Order_Begins_1">
  <Event_Type>STORY_ELAPSED</Event_Type>
  <Event_Param1>5</Event_Param1>
  <Prereq>The_New_Order_Spawn_Palpatine</Prereq>
</Event>
 
<Event Name="The_New_Order_Remove_Anakin">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>REMOVE_UNIT</Reward_Type>
  <Reward_Param1>Anakin_Skywalker</Reward_Param1>
  <Prereq>The_New_Order_Begins_1</Prereq>
</Event>
 
<Event Name="The_New_Order_Spawn_Vader">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>SPAWN_HERO</Reward_Type>
  <Reward_Param1>Darth_Team</Reward_Param1>
  <Reward_Param2>Coruscant</Reward_Param2>
  <Prereq>The_New_Order_Remove_Anakin</Prereq>
</Event>
 
<Event Name="The_New_Order_Pause">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>PAUSE_GALACTIC</Reward_Type>
  <Prereq>The_New_Order_Spawn_Vader</Prereq>
</Event>
 
<Event Name="The_New_Order_Begins_2">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>MULTIMEDIA</Reward_Type>
  <Reward_Param1>TEXT_SPEECH_REPUBLIC_NEWORDER</Reward_Param1>
  <Reward_Param2>-1</Reward_Param2>
  <Reward_Param8>REPUBLIC_NEWORDER</Reward_Param8>
  <Reward_Param9>Emperor_Loop</Reward_Param9>
  <Reward_Param10>1</Reward_Param10>
  <Prereq>The_New_Order_Spawn_Vader</Prereq>
</Event>
 
<Event Name="The_New_Order_Begins_2_Stop_Text">
  <!--Stop Text-->
  <Event_Type>STORY_SPEECH_DONE</Event_Type>
  <Event_Param1>REPUBLIC_NEWORDER</Event_Param1>
  <Reward_Type>SCREEN_TEXT</Reward_Type>
  <Reward_Param1>TEXT_SPEECH_REPUBLIC_NEWORDER</Reward_Param1>
  <Reward_Param4>remove</Reward_Param4>
  <Prereq>Execute_Order66</Prereq>
</Event>
<Event Name="The_New_Order_Begins_2_Stop_Loop">
  <!--Stop Loop-->
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>STOP_COMMANDBAR_MOVIE</Reward_Type>
  <Prereq>The_New_Order_Begins_2_Stop_Text</Prereq>
</Event>
 
<Event Name="The_New_Order_Unpause">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>UNPAUSE_GALACTIC</Reward_Type>
  <Prereq>The_New_Order_Begins_2_Stop_Loop</Prereq>
</Event>
 
<Event Name="The_New_Order_Spawn_Tarkin">
  <Event_Type>STORY_TRIGGER</Event_Type>
  <Reward_Type>SPAWN_HERO</Reward_Type>
  <Reward_Param1>Grand_Moff_Tarkin_Team</Reward_Param1>
  <Reward_Param2>Coruscant</Reward_Param2>
  <Prereq>The_New_Order_Spawn_Vader</Prereq>
</Event>
 
<Event Name="The_New_Order_Begins_3">
  <Event_Type>STORY_ELAPSED</Event_Type>
  <Event_Param1>5</Event_Param1>
  <Prereq>The_New_Order_Spawn_Tarkin</Prereq>
</Event>
</Story>