As Tony Stark and Selvig worked on the device that would be used city wide, Varia, Clint and Natasha ran through the building getting people out of the city in which Thanos would strike at first. Because thats where the Avengers were. That's where Thor and Loki were.

Thor flew the skies in patrol, ready to receive the first ships that arrive. 

Tash turns to Varia. "No-one else knows right? Bout you and the Trickster?" She spoke as vaguely as she could.

"No!" She yells over the rushing crowds running around, the army were called in to help evacuate.

"Make sure it stays that way or you'll be dead first!" Barton yells and Varia nods at them both. "I fear you may be right about the dead part anyway." She couldn't help but laugh, maybe she had lost her mind.