The Baltimore Running Festival returns Saturday to host world-class marathon runners, exercise enthusiasts, and the occasional Elvis impersonator in races of various lengths — and also to quarantine a huge part of the city for half a day. Now, the entire course is only closed from 8 to 9:15 a.m. After that, intersection closings stagger to allow traffic through.

But unless you feel up to the task of rerouting your trip according to the scheduled street closings — I know I wouldn’t — you might consider putting off those car errands until after 1 p.m., which — by the way — is a really good time to catch those Elvis impersonators, and maybe a Santa Claus or two. And a human crab.

For a complete list of closings, check the Baltimore Sun.