People enjoying food outside of a restaurant.
Some people enjoying their brunch together in the outdoor seating area of a restaurant for mother's day.
They may be having lunch, breakfast or dinner. It may be a normal day, not a mother's day.
The people enjoying food outside the restaurant must not be eating brunch and they must not be eating on a mother's day.
People enjoying food does not imply they are enjoying their brunch together.  Eating outside a restaurant does not imply they are in the outdoor seating area for mother's day.