<P> Pro-life candlelight vigil outside a Planned Parenthood location in Boston with rosary and Stations of the Cross </P> <Li> <P> Every year since 1990, people attend candlelight vigils on June 4 in Victoria Park, Hong Kong commemorating the victims of Tiananmen Square massacre </P> </Li> <P> Every year since 1990, people attend candlelight vigils on June 4 in Victoria Park, Hong Kong commemorating the victims of Tiananmen Square massacre </P> <Li> <P> A candlelight vigil in Lourdes, France . </P> </Li>

What is a vigil and what is its purpose