Some days, your biggest enemy is yourself.  Have you ever hit that “Dismiss All” button, or accidentally dismissed a reminder you wanted to keep?

Here’s how to find that reminder, so that you can reset it.

Use the search, but instead of searching by topic, type in modified:<date>

Use the date when you accidentally dismissed those reminders (causing the modification). Your view will automatically switch into the Search Tools view. If you have multiple calendars you want to search (as I do) make sure the All Calendar Items button is pressed.

It will show you all the reminders you’ve modified.

In fact, you don’t need to be too precise about dates. Here’s an example, where only the name of the month was typed in.

Still works!

You can then reopen the item and reset the reminder.