Account administrators can contact their event hosts to distribute best practices and other information. Note that you can contact hosts whose events have already happened or have yet to be approved in addition to hosts with upcoming events.
To do this as an admin, go to your Dashboard. Find the event whose host you'd like to message and click on the dropdown menu under the "Actions" header.
Alternatively, you can click on the event itself (in blue) and you'll be taken to the event page. From there, you can find the same dropdown menu by clicking "More" in the top right corner.
Select "Email event owner" and a pop-up window should appear that prompts you to write an email message to the event host.
Once you click "Send Email," your volunteer host will receive the email and you will also receive a copy.