Macau is the closest destination to Hong Kong and a great place for a day trip or a weekend break away from HK. An ex-Portuguese colony it has a similar status as a special administration region of China as does Hong Kong, but with a distinct cultural and historical heritage that makes it a different experience for the visitor.
Dragon Boat Festival is celebrated on the fifth day of the fifth lunar month. Also known as Tuen Ng Festival (端午节) it is a lunar festival that is celebrated on the 5th day of the 5th lunar month, and so it falls on a different day each year in the western calendar
Itinerary are by themes and districts at the moment but I’ll try to estimate on the time spent for those who have limited time to stay. Most districts mentioned here are easily accessed by public transport.