In the past, the only time that you can get Puto Bumbong is during the dawn masses for Christmas. Today, you can get it all year round. IMO - the best puto bumbong are still the ones that are available at Christmas time. They are typically made via traditional family recipes that are not written but passed on from one generation to the next via oral tradition. Yes - like folklore.
I had puto bumbong at the food court in SM Hypermart. It was ok - but it did not meet up to my expectations of puto bumbong. The good thing is - it's the last day of August today and tomorrow is September. You know what that means - it's the start of the Christmas season in the Philippines. Pretty soon - there will be puto bumbong stalls around the churches.