Oxford Circustube station has several entrances and at the moment I can't remember which is best.

However, once above ground it should be relatively easy: Oxford Street runs roughly East-West while Regent Street runs North-South. The northern part of Regent St.

The meeting point chosen (note great big pink poofy arrow) is Argyle Street, immediately east of the Circus. There is a reason: we hope that this will be slightly less crowded than the Circus itself and there is a pedestrianised bit too.