Here's some background and why this is an unpopular time for Chinese to get married:
The Ghost Day is celebrated on the fifteenth of the lunar month, coinciding with the full moon. During this time, it is believed that the gates of the underworld are opened and ghosts come back to Earth. The Ghost Month is representative of the Chinese belief of honoring ancestors. The Chinese believe that a good send-off to a dead loved one involves burning joss paper (symbolic of cash) and offering symbolic food as a means of caring for relatives in the after life. This is done at grave sites and ancestral altars in the home throughout the year. On Ghost Day, a place at the table - complete with a filling meal - is set in homes for each dead relative. Meanwhile, ghosts who have not received such loving care go hungry throughout the year and come back during this day - unhappy and looking to cause trouble. Chinese art depict these ghosts as gaunt creatures with straw-thin necks, representing their inability to nourish themselves, and big, distended bellies. To counteract these hungry ghosts, people burn paper money and put out symbolic food outdoors to appease these ghosts and prevent them from entering their homes.
Traditional Chinese families do not choose wedding dates during this time period for fear of unwanted gate crashers at weddings. (Talk about planning for unwanted +1's at your reception!) Therefore, this is a time where there is a seemingly unusual reprieve from weddings in Asia.