standing and eating / eating at a street stall or other establishment that has no seating

to eat while standing / to eat at a street stall or other establishment that has no seating

convenient

(collective) people, each person, everybody

busy / restless, fidgety

busy, hurried / restless, fidgety

convenience

place, location / site (location designated for some purpose) / space, room / a seat / (sumo) tournament

meal / diet

have a meal, eat