Saving Food Project (حفظ النعمة), collects all the food leftovers catered at clubs and lavish weddings, they re-sort and wrap it properly, then distribute to the needy. They have other activities too. Their numbers are:
6864833
5711910

Also, this link, below, is in Arabic (I’m not sure if there is one in English), contains a video that shows their activities.

http://www.mbaatalk.com/index.php/2007/09/02/saving-food-in-qatar/
Salam