If it's just for cutscenes, you can achieve that by doing one of following :
1) If the party members' positions are fixed :
- Make the party move to a pre-determined spot.
- Place empty events directly under your followers.
- Turn your party members invisible (only after you've changed the graphics of those events to that if your party members).
- Use 'move route' event commands to :
-> change their graphic to each actor,
-> set their movements so that they will move how you want them to. Eg, moving upwards together horizontally, rather than vertically.
2) If the party members' positions are unknown :
- Again, you can make the party move to a pre-determined spot.
- Place empty events near that spot.
- Use 'gather followers' event command.
- Turn your party members invisible (only after you've changed the graphics of those events to that if your party members).
- Use 'move route' event command to:
-> move each one to the gathered tile using through ON,
-> change their graphic to each actor,
-> set their movements so that they will move how you want them to. Eg, moving upwards together horizontally, rather than vertically.
If you want your party members to move side-by-side indefinitely, then as Venka mentioned, you need a custom script.