This small park near Berlins Ostbahnhof looks like a good place to have a short event around the morning commute. That way people from nearby businesses and hotels as well as travelers have a chance to meet other cachers.
I´'ll make sure the trackables I have with me will be visible so you can recognize who you are looking for. I´'ll try to find a bench or a place to sit near the coordinates. If there is none or it is too far, I´'ll be as close as possible to the precise coordinates.
After the event I have a train to catch with a fellow cacher.