This is the Singapore Indoor Stadium, it is located just opposite the new Stadium MRT Station.
The indoor arena is a vibrant entertainment and sports venue capable of hosting major events for up to 13,000 spectators. This is the meeting place at the Singapore Indoor Stadium where friends get to meet each other. As there were be huge crowds during a huge concert and event, it is easier to meet friends at this point.
You can read more about the Singapore Indoor Stadium from its official website. For other sky watchers, please hop over to Skywatch blog.