This webinar includes a conversation with Deb Smith former Mayor and current chair of Parkland Regional Library system and Wayne Rothe former Councillor and trustee with Yellowhead Regional Library system, with introduction/moderation by library consultant Dr. Margaret Law.
https://hbr.org/2020/02/present-your-data-like-a-pro Present your Data Like a Pro
https://www.ala.org/advocacy/making-a-budget-presentation Making budget presentations
https://boardsource.org/advocacy-briefing-guide-for-board-members/ A how to guide for meeting with elected officials (although this is a US source, the principles are the same)
https://accessola.com/wp-content/uploads/2020/08/2019-11-Advocacy-Toolkit-2019.pdf Ontario Library Association Advocacy Toolkit