While in a Split View, you may also use Drag & Drop to add text (event title and notes) in Calendars if use iOS 11 on your iPad. For this, please:
- Open the two apps in Split View ( for instance, Calendars and Notes app).
- To drag and drop text, select the text first, then touch and hold the text until it lifts up.
- Drag the item to the other app and drop it.
Note: Currently, Calendars doesn't support attachments, and you won't be able to drag & drop a photo or a file.