Getting the right attention and focus on your presentation may start from the perspective of your audience with the invite. Therefore it makes sense for you to spend some time to ensure you have a high quality invite for your presentation. The invite should be brief, generate interest, manage the expectations and be clear about timing and other logistic matters.
A well designed and written invitation for your presentation will assist in setting the quality perspectives of your audience.
Think about using the power of 3 in your invite.
Read more about this in the book that is part of the Public Speaking Kit.