MARRIAGE is no bed of roses: ask the dozens of couples camping on the tiles of the Queensway Government Offices for up to three nights to ensure their weddings can fall on the most auspicious day of the lunar calendar. They want to tie the knot on Saturday, November 19, and as the Marriage Registry takes bookings only three months in advance, reservations for that day open at 9 am. Only 11 couples can get married at Cotton Tree Drive and 43 at City Hall. At the head of the queue of about 50 people were Thomas Yuin Leung-hung and Jenny Wong Yin-yi. Mr Yuin, the 28-year-old owner of a restaurant in Yau Ma Tei, said: ''We want our wedding at 11.30 am on November 19. ''And as we confirmed the booking for our wedding banquet seven months ago and it would have been diasterous if we missed the date.'' Behind them were Dicky Cheng Siu-tin and Ivy Lau Kam-lan, who took up their spot just three hours after Mr Yuin. Miss Lau, a 25-year-old secretary, wants the 2 pm slot at City Hall. Gary Leong Kui-wing and Irene Wong Shuk-chun are third and practised wedding-day smiles in the knowledge that their plans to be married at Cotton Tree Drive at 11.30 am were safe. Mr Leong started lining up on Tuesday evening when he saw that two people had already taken up their positions near the door on the walkway outside Pacific Place. ''I had just finished a job and was on my way to the office,'' he said. ''I got scared that more would be coming, so I called the office, asked for some holidays and stayed put.'' It was not until Miss Wong finished work and took a shift in the queue that he was able to rush to his home in Southern district to take a bath and pick up a mattress. Ms Wong said: ''I know this is hard for him. But it is a good chance to show how much he values our marriage and how deeply he loves me.'' The pair have been going out for nearly seven years and decided to get married on November 19 when their parents told them it was the most lucky day on the Chinese calendar. ''We were told getting married on that day would bring us luck and happiness. I am not sure if it's true. But doing so can please our parents and make us feel secure,'' said Ms Wong. ''Besides, it's a Saturday and most of our relatives and friends will be free from work to join our wedding.'' Fung shui expert Chung King-kwong said according to the lunar calendar, the date was an ''earth day'' and good for marriage. ''Earth is soil which is good for plantation. People being married on the day will see their family bloom, like a plant in good soil,'' he said. But he warned the day was only good for people born in summer; those born in winter would experience less than marital bliss - and quarrel.