The Heart Sutra is one of the most important sutras. It describes the central philosophy of Buddhism, which is sunyata, emptiness.
The regular recitation of the Heart Sutra is common in many monasteries and other places, to ward off obstacles, to clear your path, to get out of all obscurations.
Rinpoche gives a word by word explanation of the Heart Sutra, with plenty of time for Question & Answer.
There exists an only slightly edited transcript of these teachings.
The exact date of the visit is not clear.