estuvieron firmando
-they/you were signing
Preterite progressive ellos/ellas/ustedes conjugation of firmar.

firmar

Meagan Marie, Jason Dozois y Heath Smith, estuvieron firmando las litografías proporcionadas a la entrada, conversando y haciéndose fotos con los fans en el photocall.
Meagan Marie, Jason Dozois and Heath Smith were signing the welcome lithograph gifts, talking with fans and takes pictures from the photocall.
Word of the Day
marzipan