Presence is the difference between having an experience and merely being physically near it.

You can be in the room and not present in it, and the difference is entirely a matter of where attention is. Physical proximity is easy to supply and easy to mistake for participation, which is why people can spend an evening together and separately be elsewhere the whole time.

Ask yourself, during something you are already attending, whether you are actually here. If not, come back to what is in front of you. The attendance is not the gift. The attention is.