What promotion is this? Hint- something to do with trains

Are these structure museums or some hi-tech buildings?
These are the new CCL train stations.

CCL = Circle Line, and these stations are opening for preview on 04Apr.

Wait! What is so happening about a few more MRT stations?
Look at the host of programmes on 04Apr from 1130 to 1800.

You have fasion shows, charities, band performances, and free museum passes!!
Hooray, more fun is coming for our sengkangbabies.
Maybe we will check out some stamps at one of the museum :-)

For more details -->http://www.circlelinediscovery.sg