I'm using jEvents 3.4.46 and I've noticed that I'm having a ton of bots hitting the site every few seconds, it appears they are crawling every date going back many years.

In my config I have first year 2018 and last year 2019, but they are scanning back much further than that.

In the performance options I have "Set meta-tag to stop robots crawling." set to YES

Any ideas how I can prevent these bots from scanning?