Hello

By searching the internet with a suffix of “site:edu” you will get mostly Extension and University results. These will have reliable information for you on garden tool care. Here is one example of a search:

Garden tool maintenance site:edu

Next, click the “videos” tab at the top of the search results screen, and there are Extension videos that come up. Here are some examples:

https://www.youtube.com/watch?v=GXD12sUiI8w

https://extension.msstate.edu/southern-gardening/video/2018/sharpening-your-tools

https://www.youtube.com/watch?v=jAEc0DfvyY0&t=2518s

There are also many Extension bulletins that address tool care. You might want to select one and print it out as a handout for your event.

For example: https://hort.extension.wisc.edu/articles/maintaining-lawn-and-garden-tools/