[arrl-odv:30627] Agenda - help me understand and explain to angry members

Members have been emailing me, accusing us of hiding things because the agenda is not distributed to them beforehand. Now, we know better - things get added last minute, and the agenda changes. It shouldn't be, but that is what we have. Two questions: 1. How can we make it that we have an up to date agenda distributed to members before the meeting? 2. How can we effectively communicate that the final agenda was amended (or substituted) during or right before the meeting? Thanks Ria N2RJ