diff --git a/calendar_grabber.py b/calendar_grabber.py
index 2e19df5..fed3ea2 100644
--- a/calendar_grabber.py
+++ b/calendar_grabber.py
@@ -10,9 +10,12 @@ from event import Event
 
 class CalGrab(object):
 
-    def __init__(self, auth_file, calendars=[], callbacks=[]):
+    def __init__(self, auth_file, calendars=None, callbacks=None):
+        if callbacks is None:
+            callbacks = []
+        if calendars is None:
+            calendars = []
         self.calendars = calendars
-        # TODO: Add multiple calendar support
         self.callbacks = callbacks
         self.creds = service_account.Credentials.from_service_account_file(
             auth_file, scopes=['https://www.googleapis.com/auth/calendar.readonly'])
@@ -24,32 +27,32 @@ class CalGrab(object):
     def update_at_interval(self, frequency, time_to_update=-1):
         """
 
-        :param frequency: Amount of time to wait between updates in seconds
-        :param time_to_update: normally set to -1 aka no limit.  Time in minutes to continually ping the api for.
-        :return: None
+        :param frequency:
+        :param time_to_update:
+        :return:
         """
         start = None
         while True:
-
             try:
-                now = datetime.utcnow()  # 'Z' indicates UTC time
+                now = datetime.utcnow()
                 if start == None:
                     start = now
-                events_result = self.service.events().list(
-                    calendarId='loskorep@productiveedge.com',
-                    timeMin=now.isoformat() + 'Z',
-                    maxResults=10,
-                    singleEvents=True,
-                    orderBy='startTime'
-                ).execute()
-                events = events_result.get('items', [])
-                if not events:
-                    print('No upcoming events found.')
-                    return
-
-                events = [i for i in [Event.get_from_gcal_api_json(json) for json in events] if i is not None]
+                events = []
+                for calendar in self.calendars:
+                    events_result = self.service.events().list(
+                        calendarId=calendar,
+                        timeMin=now.isoformat() + 'Z',
+                        maxResults=10,
+                        singleEvents=True,
+                        orderBy='startTime'
+                    ).execute()
+                    events = events_result.get('items', [])
+                    if not events:
+                        print('No upcoming events found.')
+                        return
+                    events.extend([i for i in [Event.get_from_gcal_api_json(json) for json in events] if i is not None])
                 print(events)
-
+                events = sorted(events, key=lambda event: event.start_time)
                 for callback in self.callbacks:
                     callback(events)
                 if time_to_update > 0 and (now - start).total_seconds() > time_to_update: