Audio is an excellent way of communicating with your audience. Many people now listen to podcast as it is a great way for people to catch up on the latest news at a time that suits them and whilst they are carrying out other jobs.
Good communications don't just end once the messages have been shared. You need to analyse the effect they have had.
On-farm demonstrations have been organised for at least two centuries, originally as a way to introduce farmers to innovation, but more recently also to share experiences in a farmer-to-farmer setting, and to support knowledge co-creation between farmers and other actors. Increasingly, farmers themselves are opening their farms to connect with their peers and the general public as part of business development strategies (e.g. short food supply chains, community supported agriculture).