Oppo
Create an Event in Calendar auf Oppo
The Calendar app on Oppo phones bundles several entry types under one Add button: events, goals, reminders, and tasks.
Picking the wrong type is the most common reason a location field, due date, or reminder toggle seems to be missing after saving.
Steps to add an event
Open Tap on Calendar ➔ Tap on Add ➔ Choose an Option. Selecting Event here shows the fields you need, unlike Task or Reminder.
Next, Add a Title so the entry is easy to find later. Then use Set other Options to set the date, time, location, and any notification.
Finish with Tap on Save. If the event does not appear where expected, check whether it was accidentally created as a task or goal instead.
Reminders that never trigger usually point to a notification toggle left off inside Set other Options, not a system-wide setting.
