By Soo-hyang Choi SEONGNAM, South Korea (Reuters) – Against the backdrop of Christmas songs, 100 South Korean men and women gathered at a hotel near Seoul dressed in their best with name tags hanging on their clothes, hoping to find love. The government hopes they make babies. They were participants at a mass blind-dating event hosted by Seongnam city, an attempt by the local government to reverse a falling birth rate in a country where the popularity of marriage and enthusiasm towards parenthood have nosedived. The participants, in their 20s and 30s, sat quietly next to one another until a re…