How to get calender notications in the bell icon

hi guys, how do we enable notifications for all events ? suppose i have a lead and i have created and event to call him on next monday ? how can the system remind me ? with a pop or bell icon notification etc

any idea guys ?

Check this out here you can see the colander events of the day

@Abhijit_undre yes i know buddy but its all blank … i dont see any event there… i have added 3-4 calendar event but nothing shows there…

the question is how does the event show in that place ?