Hi Pranati,
The events widget is part of the native mobile resource module https://marketplace.mendix.com/link/component/109513
Best,
Mitchel
Install the “Push Notification connector”, it will add the “OnPageLoad_RegisterPushNotification” nanoflows for you to choose. https://marketplace.mendix.com/link/component/3003
Do read this as well, to install required dependencies and to understand overall flow. https://docs.mendix.com/howto8/mobile/notifications