How to get the return value to the server which have multiple nested promises as in case of google Calendar API

Question

I'm not sure how to get return value from the below code. I want to get the return value from authorizeAndListEventsNew method which was obtained from createEvent.

How should i get the return value promises within the promises, I tried using async and await along with promises but dosent work out.

 function authorizeAndListEventsNew(createEvent,name,d,loc,mobile){
        return fs.readFile("credentials.json",(err,content)=>{
            if(err) return console.log('Error loading client secret file',err);
            const {client_secret, client_id, javascript_origins} = credentials.web;
            const oAuth2Client = new google.auth.OAuth2(
                client_id, client_secret, javascript_origins);
            return fs.readFile(TOKEN_PATH, (err, token) => {
                if (err) return getAccessToken(oAuth2Client, callback);
                oAuth2Client.setCredentials(JSON.parse(token));
                callback(oAuth2Client,name,d,loc,mobile);
            });
    
        });
    }
function createEvent(auth,pname,std,loc,desc){
    const calendar = google.calendar({version: 'v3', auth});
    listUpcommingEvents(calendar,std).then((res)=>{
        var newDt=new Date(std);
        if(res.length>0){
            var sortEvts = res.sort((a,b)=> a - b);
            var lastEle = sortEvts.slice(-1).pop();
            newDt.setTime(lastEle.getTime());
            
        } else {
            newDt.setHours(09,0,0);
        }
        var endTime = new Date();
        var d = new Date(newDt);
        var endTime = moment(d).add(10,"m").toDate();
        var event = {
            'summary': pname,
            'location': loc,
            'description': desc,
            'start': {
                'dateTime': d.toISOString(),
                'timeZone': 'xxx'
            },
            'end': {
                'dateTime': endTime.toISOString(),
                'timeZone': 'xxx'
            },
            
            };
            calendar.events.insert({
                auth: auth,
                calendarId: CALENDAR_ID,
                resource: event,
              }, function(err, event) {
                if (err) {
                  console.log('There was an error contacting the Calendar service: ' + err);
                  return true;
                }
                console.log('Event created: %s', event);
                return false;
              });
    });
};