Start with official guidance.
Canadian Heritage provides guidance on displaying the National Flag, including arrangements with other flags. Check the guidance relevant to the display you are planning.
National Flag of Canada etiquette
Confirm who authorizes changes.
For half-masting, identify the responsible person and the instructions that apply to your organization. Federal rules describe the federal context; they should not be assumed to replace every organization’s policy.
Rules for half-masting the National Flag of Canada
Ask before reproducing a design.
Use approved artwork and obtain any permissions needed for organizational, municipal, Indigenous or other protected designs.