Hi Shalini,
In calendar widget, we can’t able to create a event, if you want to create a event, you should configure the outlook integration then you can add the events.
https://medium.com/mendix/creating-outlook-meetings-from-your-mendix-app-c6e3c441ec0
please refer this blog
Thanks
Hari
Please download the test project and according to test project configure your usecase.
https://github.com/mendixlabs/calendar/releases/download/v1.0.3/TestProjects.zip
Does Your Dataview have Event Entity as Context?
Select DataSource for calendar widget from either context, database, MF, or NF and try it out.