The lunar eclipse is viewable from pretty much anywhere on the west coast (weather permitting), but the Observatory is a great places to watch from, with telescopes available for free viewing.
The Café at the End of the Universe and Stellar Emporium will both have carts outside during the vent.
Limited paid parking is available near the Observatory. Free parking is available in Greek Theatre area all day. The easiest way to get to the Observatory is via the Metro Red Line and the DASH Observatory bus, which will operate later than usual for the event. Inbound Griffith Park access via Vermont ends by 10pm, possibly earlier, but the DASH bus will be allowed entry until 11pm.
Fern Dell/Western Canyon entrance into Griffith Park closes at sunset as usual.
Can't make it to Griffith Park? The Observatory is live broadcasting the eclipse from the historic Zeiss telescope on Griffith Observatory's LiveStream page.