At the moment it is Ramadan, which has its own set of rules which I xpect youre finding out about.
   The main thing I've learnt is, be patient. people may not want to sing when you would like them to. They may not be in the mood. And dont expect songs to start, go on for a bit, and then stop three minutes later. Some last for two seconds, some for twelve hours. And dony expect to be able to whistle the tunes. Iranian music is,well, Iranian. It all takes time! And the more time you take, the more you will be rewarded in every way. Have fun!!