The meeting was hosted by West Sussex County Council chairman Mike Coleman after a request from the Foundation for Social Improvement, which encourages small charities to join forces.
It marked the end of the nationwide Small Charities Week.
“I was happy to lead the event, which was a landmark meeting for many of the small charities,” said Mr Coleman.
“These days many of them are being called on to contribute to the Big Society, and simply getting to know each other means many can now think about sharing resources.”
A total of 49 individual charities from all areas were invited to attend.
“I learned a great deal about new initiatives and challenges that are under way,” said Mr Coleman.
“As a council we can now see if there are ways in which we can help these smaller organisations.”