Hi, Does anyone have any idea how can we connect google calendar with netsuite’s calendar?

You would need to set up oauth on the google developers end. You can then use the grant-type refresh token to authenticate via an https.post request in NetSuite to get you an access token, and then use that token to make a call to the google calendar API to either read/write. Also, I'm sure there are third parties that offer monthly paid integrations. I assume you want to do this via a script, however, due to you posting in this channel.

Yes we want to do it on our own