All ConvertKit plugin tutorials:
Before you start reading this article, please make sure you read this.
In this article, we are assuming you have already followed this and also you have created the sequences with your reminders in your autoresponder or created the tags that would trigger the reminders in an "Automation" in convertkit.
Go to your event editor > "Plugins" > "Convertkit Plugin" > View
Let's say you want to tag everyone who attended your webinar, to do so, just follow this.
All the other options work the same way. Here is another for those who didn't attend webinar.
You can also use that tag to create an automation or a rule in ConvertKit that will send people an email.