Events are easy to add in REDCap. Just go 1. Go to Project Setup, make sure "and enable Use longitudinal data collection with defined events?" is enabled, and then
...
2. In Project Setup, select Define My Events. 
...
3. This will open the Define My Events screen.
If you need to add events, you can fill in the details and add events one by one to your project.
...
Or to add multiple events at once, you can select Upload or download arms/events.
...
4. Choose Download Events (CSV) to download your events file and make . Make additions and/or changes, then save the file as a CSV file.
...
5. Select upload file and upload Upload events (CSV) to upload your saved CSV file. This This will add new events to your REDCap project.
...