There's a crew launch to the ISS from KSC tonight at 9:03 PM EST. Should be visible all along the east coast. Will be in shadow the whole way, but the orange 2nd stage engine should be easy to spot. Here's the simulated view looking over the Tidal Basin:
The red line is the Crew Dragon track while the 2nd stage is burning. The blue line is the track of the ISS about 9 mins before launch, however ISS will not be visible since it will be in earth shadow. Max Dragon elevation should be 15-20 deg in D.C.
Here's the view from Boston Common:
The end of the red track here is SECO (second engine cutoff, 8.5 mins after launch). The green line is the coast track, but it will be invisible after SECO.
Look SW for Jupiter, Saturn (much fainter) and the moon. The tracks should start below those and move left across the sky. Here's the
heavens-above sky chart for the invisible ISS pass, but Dragon will follow roughly the same track across the sky 10 mins later (and a little lower).
Online livestream will be here:
https://www.spacex.com/launches/Crew is already suiting up and getting ready to head out to the pad.