Its a community iftaar, ie breakfast. It usually consists of dates, fruit, and some high calorie snacks 0 this is followed after prayer and some relaxation/socialising, by dinner. During Ramadan, it is convention to send breakfast [which is eaten at sun down, when we break fast] to those who are fasting, often its just easier to call as many people as you know to sit down and eat with you. You can call anyone to share iftaar, family, friends, neighbours even strangers. Most often, masjids [mosques] make good locations for sharing iftaar with people you don't know. All you do is take the food and the mosque will usually arrange it for you.