Prime Minister Lee Hsien Loong announced the "Four Million Smiles" campaign, in which a giant mural of user-submitted digital photos will welcome about 16,000 delegates to the International Monetary Fund and World Bank Group meetings in September.
Each person can only submit one photo, and participants will be eligible to win prizes, such as a car or Singapore Airlines tickets to various Asian cities, Channel News Asia reported.
Lee encouraged not only citizens but permanent residents and foreign workers to submit their photos to a Web site before Aug. 2.
"It's more than just a collection of friendly faces, but our collective desire to offer our guests a positive, unique and unforgettable Singapore experience," Lee said.
Notable deaths of 2014 [PHOTOS]