i have a new iphone 6s but my calendar events are not on my new phone

Go to Settings > iCloud

And Enable Sync for Calendar also

You have to add an email provider and / or calendar like iCloud, Yahoo or Gmail

Then you will see events in the calendar if you have them in the other application

Add you the account that includes your calendar in Settings>Mail, Contacts, Calendars>Add New account. Once you've done that, open the Calendar app. Tap on "Calendars" in the bottom center of the screen and make sure that you have the correct calendars selected.

Read here:

Transfer content from an iPhone, iPad, or iPod touch to a new device - Apple Support

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