"I feel that the response of the world is slow - not the same as it was for the Haiti earthquake or as it was for the tsunami - so I feel a little desparate," said Dr. Meher Tabatar with the Association of Physicians of Pakistani Descent.
More than 20 million Pakistanis have been affected by the flood. Monday's gathering of more than 500 was a plea for help for their homeland.
Like many at the event, Asyia Ahmed Imam had family and friends in Pakistan and said the need was growing more and more by the day.
"If we take a little bit of food, like 50 bags, they are afraid to go because people start snatching the food and they are ready to kill for the foo. So it's so bad," she lamented.
Organizers said without the coverage from mainstream media many Americans don't know about the widespread need for aid.
Lawmakers and local officials who were helping to spread the word said it was time to act.
"For all the right reasons you should respond again now,"said former California Governor Gray Davis.
Organizers assured the public that every penny raised will go to the victims and will not end up in the wrong hands.