Using the calendar method I posted on http://onxmarket.com/GoogleCalendarWorkaround

Recipe made in response to https://dev.onx.ms/forums/topic/suggestion-rule/#post-1419

Usage
Set the "feed" , to any Google calendar feed. Make sure to use the "full" version of the feed.
var userAccount = {feed: "https://www.google.com/calendar/feeds/your_calendar_feed_here/full"};
settings.checkInterval  The interval for checking upcoming events
settings.reminderMinutes  Number of minutes before "running late" to get the notification

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To use this on{X} Recipe, simply copy the code below and modify if needed.

// This is a sample code for a basic rule you can create.
var userAccount = {feed: "https://www.google.com/calendar/feeds/your_calendar_feed_here/full"};
var settings = {checkInterval: "hour", reminderMinutes: 30};

// modify with care, implementaion depends on the specific parameters
var googleQueryParams = "alt=json&ctz=UTC&max-results=5&singleevents=false&futureevents=true&orderby=starttime&sortorder=ascending&fields=title,entry(title,gd:when,gd:where)";

// calculates the time form current location to the specified destination
function getTimeToDestination(event, destination, timeCallbackSuccess) {    
    var currentLocation = device.location.lastLocation.location;
    var fromTo = [ currentLocation.latitude +','+ currentLocation.longitude,
                destination];                
    feeds.traffic.get({wps: fromTo, unittype: 'm'},
        function(traffic, textStatus, response) {
           console.info('The traffic duration for '+ destination +' is: '+ traffic.totalTravelDuration +'sec');
           // duration is given in seconds, modify to minutes
           timeCallbackSuccess(event, traffic.totalTravelDuration / 60);
        },
        function(response, textStatus) {
           console.error('getting traffic to '+ destination +' returned error : ' + textStatus);
        }
    );
}

console.log('CheckMyCalendar started');
device.scheduler.setTimer({ name: "meetingTooFarCheck", time: 0, interval: settings.checkInterval, exact: false },
    function () {
        console.log('get upcomming meetings from ' + userAccount.feed);
        // get the upcoming meetings
        device.ajax(
            {    
                url: userAccount.feed + '?' + googleQueryParams,
                type: 'GET',
                headers: {'Content-Type': 'application/json'}
            },
            function onSuccess(body, textStatus, response) {
                console.log(textStatus);
                var feed;
                if (!(body && (feed = JSON.parse(body)))) {
                    console.error('invalid body format');
                    return;
                }
                // get the actual feed
                feed = feed.feed;
                
                // check we have any entries
                if (!feed || !feed.entry) {
                    console.info('no future events for '+ feed.title.$t);
                    return;
                }
                
                // process the events
                var eventCount = feed.entry.length;
                console.info('got '+ eventCount +' events for '+ feed.title.$t);
                // get check upcoming events
                for (var i = 0; i < eventCount; i++) {
                    var eventEntry = feed.entry[i];
                    if (!eventEntry.gd$where || !eventEntry.gd$where[0].valueString) {
                        // no location
                        console.log('no location for: ' + eventEntry.title.$t);
                        continue;
                    }
                            
                    // calculate time to destination
                    getTimeToDestination(eventEntry, eventEntry.gd$where[0].valueString, function(event, minutes) {
                        var title = event.title.$t;
                        var startTime = new Date(event.gd$when[0].startTime);
                        if (!startTime || isNaN(startTime.getTime())) {
                            console.error(title +' bad date: ' + event.gd$when[0].startTime);    
                            return;
                        }
                        
                        var now = new Date();
                        var minutesToStartTime = Math.floor(startTime.getTime() - now.getTime()) / (60 * 1000);
                        // no need to notify, it's too late
                        if (minutesToStartTime < settings.reminderMinutes) {
                            console.log(title +' under reminder limit');
                            return;
                        }
                        
                        var minutesToArrive = Math.floor(minutes + settings.reminderMinutes); // arrive + buffer
                        // check if we can arrive on time
                        if (minutesToStartTime < minutesToArrive) {
                            var notification = device.notifications.createNotification('Running late for ' + title);
                            notification.content = 'Takes '+ Math.floor(minutes) +'minutes to get there';
                            notification.on('click', function() {
                                device.browser.launch(event.link[0].href);
                            });
                            notification.show();
                        }
                    });
                }
            },    
            function onError(textStatus, response) {
                console.error(textStatus);
            }
        );      
    });