The two-day protest, publicized on Facebook, drew 60 fasters and 800 online comments.
Forty Saudis plan a hunger strike this week to bring attention to the prolonged detention of 11 political activists.
In an emergency meeting Friday, OPEC tries to prop up oil prices as a looming global recession dampens demand.
Those arrested are implicated in operations that occurred between 2003 and 2006.
Economists say that Arab states such as Saudi Arabia will feel the pinch, but a year of record oil prices provides a deep cushion.
About 3,200 former militants have completed the ambitious program aimed at persuading them to disavow violent Islamist ideologies.
A debut novel by Zoe Ferraris delves into the social complexity of Saudi Arabia.
At a rare meeting Sunday, some oil-producing nations tried to stabilize prices – and Western concerns over a recession.
But short-term pressures may keep them up for a while.
Some say it's a sanctuary for business women. Others see it as another sign of gender segregation in a male-dominated society.