Someone selling, working, or attending a celebration does not become an available photographic subject simply by being visible to visitors. Asking before making a portrait changes the relationship: it recognizes a person who can decide about their image. The question should come before raising the camera and should allow an easy refusal without repeated requests or a required explanation.
Explain the use
Approach without obstructing work and explain what you want to photograph. A private memory differs from an open publication or an image promoting an activity. If you do not yet know how you will use the photograph, do not promise it will remain private. A vague agreement may not cover what you later decide to do with the file.
An answer may include a boundary: no face, no house in the background, or only after a task is finished. Respecting that condition is part of permission. If someone hesitates, do not treat silence as acceptance. Thank them and put the camera away. Buying a product or paying admission does not automatically purchase a portrait of the person working there.
Children and gatherings
With children, avoid asking them to decide alone about publication. Seek agreement from the responsible adult and consider whether the child also wants to participate. Even with permission, sharing names, schools, addresses, or precise locations is unnecessary. An image may circulate far beyond the setting in which it was taken.
At a community gathering, first ask organizers about their expectations. Some moments may be public while others are not recorded. General permission to photograph an event does not replace agreement for a close portrait. If someone asks for an image to be removed, act within the spaces you control without promising to erase every copy that may already have circulated elsewhere.
Review before publishing
Before publishing, inspect the whole frame. One person may have agreed to the portrait while others, documents, or private details appear behind them. Choosing another photograph or not publishing can be the more considerate decision. A meaningful memory does not depend on displaying every face encountered during a trip. It may also preserve a conversation or the experience of accepting a boundary.