I haven't been able so far to find any video or articles on the active shooter drill. The only way I knew of the drill is from another post on the shoes -

https://greatawakening.win/p/16amU47QQw/the-shoes-dont-match-entry-filme/

And I responded to someone who posted the archived link, but I went to the actual article page to click the twitter links to watch the videos. Here's what I posted on that other post...

The reporter whose mother-in-law that works at the school who also happened to be at the “active shooter drill” that happened a year before this event.

Here’s the link to the article:

https://www.yahoo.com/entertainment/nashvilles-covenant-school-held-active-153759316.html?guccounter=1

Reporter telling how her MIL works at the school and stepped away to take a break right before the shooting:

https://twitter.com/SamSagnella/status/1640392323044462593

Reporter talking about being at the “active shooter drill” the year before:

https://twitter.com/SamSagnella/status/1640394324616552448