Lemme help you guys out a little from trolley experiences
I usually only take the blue line from Beyer station to downtown, rarely do I use the orange line and never green line so I won't say anything there
Beyer trolley station to 12th and Imperial (convention center) about 40 mins time and Beyer station is all the way on the far side of the track
Anything closer than that and just subtract aprox. 3 mins
Any station higher than H street and you get there in less 30 mins
The stations from Old Town to 12th and Imperial take even less time because they're closer together
Though the hotels will probably be more expensive than down south
Convention center opens at 8:30... I think
You can wake up at 7 and make it just fine to comic con
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Hope this helps somebody