If you put the time, energy, and effort into preparing something for other people’s benefits, shouldn’t they show up? Unless you have convinced them beforehand, there’s no reason for them to be present.
Missed a webinar? Watch the recording.
Missed an event? Send me the slides.
Missed a podcast? Add it to the queue.
In the era of asynchronous communication channels, people have less reason to be where you want them to be. Make sure they understand the loss of not being there.