Muslims all around the world will abstain from food and drink, through fasting, from dawn to sunset. At sunset, the family will gather the fast-breaking meal known as Iftar. The meal starts with the eating of a date — just as Prophet Muhammad used to do. Then it's time for the Maghrib prayer, which is the fourth of the five daily prayers, after which the main meal is served. [13]
Over time, Iftar has grown into banquet festivals. This is a time of fellowship with families, friends and surrounding communities, but may also occupy larger spaces at mosques or banquet halls, where a hundred or more may gather at a time.[14]
Most markets close down during evening prayers and the Iftar meal, but then re-open and stay open for a good part of the night. Muslims can be seen shopping, eating, spending time with their friends and family during the evening hours. In many Muslim countries, this can last late into the evening, to early morning. However, if they try to attend to business as usual, it can become a time of personal trials, fasting without coffee or water.
more info:
http://en.wikipedia.org/wiki/Ramadan#Fasting