Ask before stepping in
Some spaces are working shops or private premises. Check whether visitors are welcome before treating an entrance as part of a walking route.
Leave the walkway open
Move a group discussion to the side and keep doorways clear. Choose a separate regrouping point instead of stopping at the narrowest passage.
Keep the return simple
Share a final meeting place and check the way home from there. Finish the outing while the group still has time for an unhurried departure.