Dagny and Terezi
Terezi was blind, yes, but she would still be able to 'see' the fireworks by smelling them. She'd know what colors there were and everything, but she still let Dagny be her eyes. The little girl just wanted to help and Terezi wasn't going to tell her no.
She had found a good spot and was sitting on the blanket. "Yep, it shouldn't be long now," she grinned. She loved fireworks and couldn't wait. "Want some snacks while we wait?" she asked, gesturing to the pile of candy and snacks she had with her.