It takes some time before my events sync between iPhone and iPad. Why?

Let's configure how new data is fetched by your devices. To do so, please follow the steps below:

1. Open iPhone Settings app
2. Go to "Mail, Contacts, Calendars"
3. Tap "Fetch New Data"
4. Turn "Push" ON (very first cell)
5. Ensure iCloud is set to "Push". This means that data will be pushed to your device when possible. Do the same for any other calendar that you want it to get updates as soon as possible. Please remember that Push consumes more battery life.
6. Repeat steps above on iPad