What are the "must-see" spots within Kuala Lumpur if I need to spend only a day or two in the city?

im traveling to kl on the 26 till 29, where can i catch a rock liveband in kuala lumpur?

I'm planning a trip to KL during the Hari Raya Haji period (27th Nov - 29th Nov) and I would like to know if the shops will be open. My friend visited KL recently during the Hari Raya Puasa period and she told me that all the shops were closed and there was nothing to do so I'm worried this would happen to me too. Thanks =)