Who| Valeria, Any D3 Tributes who want to complain about discuss their cosplay outfits.
What| See above
When| Just before they're let out into the Arena.
Where| Dressing rooms the Tributes prepare in before heading out. I'm assuming they are put into individual same as the movie, Valeria will be checking in on all of her Tributes going from room to room.
Warnings| Usual Valeria oblivious horribleness, possible references to recent plot events re: execution/torture/bombing.

Normally Valeria looked forward to this time. The pressure on her was minimal, every Tribute generally wearing the same thing with few if any alterations by the Stylists allowed, and it meant she'd soon get some time to relax before her Tributes started dying and waking up back in the Capitol again.

Now, however, she'd had the stress of trying to figure out costumes for each one (oh how she missed only having two), when she barely paid attention to fiction even back when she had the time, but after everything that had happened so recently...suffice to say it was a shaken and trying to hide it Valeria who entered each dressing room in turn, making sure her Tributes were dressed or at least in the process of getting ready to go.