Ching Ming Festival in Hong Kong falls on either April 4th or 5th each year depending on the Cold Food Day.
People will take this day to visit their relatives graves and pay their respects. They can bring offerings like paper money or other things paper that they will burn. They also will bring incense and joss sticks.
In the past Ching Ming Day was celebrated 3 days after the Cold Food Day. This day is also called "Remembrance of Ancestors Day" or "Grave Sweeping Day".