diff --git a/db/booking.ts b/db/booking.ts
index f7a8be0..5538daa 100644
--- a/db/booking.ts
+++ b/db/booking.ts
@@ -5,7 +5,6 @@ import { createCalendarEvent, deleteCalendarEvent } from '../lib/googlecalendar'
 
 import { Bill } from './bill'
 import { BOOKING_STATUS, VALIDATION_ERRORS } from './enums'
-import { getBookedDays } from './index'
 
 export type Booking = {
   uuid: string
@@ -76,7 +75,7 @@ const BookingSchema = new mongoose.Schema<BookingDocument>(
         validator: async function (days: string[]): Promise<boolean> {
           const booking = this as Booking
           const uuid = booking.uuid && [booking.uuid]
-          const bookedDays = await getBookedDays(uuid)
+          const bookedDays = await BookingModel.findBookedDays(uuid)
 
           const doubleBookedDays = days.filter((day: string): boolean =>
             bookedDays.includes(day)
@@ -155,8 +154,10 @@ BookingSchema.static(
   }
 )
 
-export default (mongoose.models.Booking ||
+const BookingModel = (mongoose.models.Booking ||
   mongoose.model<BookingDocument, BookingModel>(
     'Booking',
     BookingSchema
   )) as BookingModel
+
+export default BookingModel;
diff --git a/db/index.ts b/db/index.ts
index 3c0f917..758df94 100644
--- a/db/index.ts
+++ b/db/index.ts
@@ -1,7 +1,9 @@
 import * as mongoose from 'mongoose'
 import BookingModel, { Booking, BookingDocument } from './booking'
 import BillModel, { Bill } from './bill'
+import { getBookedDays as calendarGetBookedDays } from '../lib/googlecalendar'
 import { BOOKING_STATUS } from './enums'
+import { uniqueFilter } from '../helpers/array'
 
 let connectedPromise: Promise<mongoose.Mongoose>
 
@@ -21,7 +23,12 @@ export async function getBookedDays(
   uuidsToIngore?: string[]
 ): Promise<string[]> {
   await connect()
-  return BookingModel.findBookedDays(uuidsToIngore)
+  const bookedInDatabase = await BookingModel.findBookedDays(uuidsToIngore);
+  const bookedInCalendar = await calendarGetBookedDays();
+
+  return [ ...bookedInDatabase, ...bookedInCalendar]
+     .filter(uniqueFilter)
+     .sort();
 }
 
 export async function getBookingByUUID(uuid: string): Promise<BookingDocument> {
diff --git a/helpers/array.ts b/helpers/array.ts
index 8ac2e20..5493526 100644
--- a/helpers/array.ts
+++ b/helpers/array.ts
@@ -16,3 +16,7 @@ export function getNextBigger<T>(array: T[], pivot: T): T {
 
   return array.sort().find((day) => day > pivot)
 }
+
+export function uniqueFilter(value, index, self) {
+  return self.indexOf(value) === index;
+}
diff --git a/helpers/date.ts b/helpers/date.ts
index 2ed39c3..3d9776f 100644
--- a/helpers/date.ts
+++ b/helpers/date.ts
@@ -1,4 +1,4 @@
-import { parse, format, addDays } from 'date-fns'
+import { parse, format, addDays, subDays } from 'date-fns'
 import { utcToZonedTime } from 'date-fns-tz'
 
 const FRONTEND_FORMAT = 'dd.MM.yyyy'
@@ -21,9 +21,11 @@ export function daysFormatFrontend(days: string[]): string {
 export function getDays({
   startDate,
   endDate,
+  endDateExclusive = false,
 }: {
   startDate: Date
   endDate: Date
+  endDateExclusive?: boolean
 }): string[] {
   let currentDay = new Date(startDate.getTime())
   const days = [dateFormatBackend(currentDay)]
@@ -32,7 +34,9 @@ export function getDays({
     return days
   }
 
-  while (currentDay < endDate) {
+  const inclusiveEndDate = endDateExclusive ? subDays(endDate, 1) : endDate;
+
+  while (currentDay < inclusiveEndDate) {
     currentDay = addDays(currentDay, 1)
     days.push(dateFormatBackend(currentDay))
   }
diff --git a/lib/googlecalendar.ts b/lib/googlecalendar.ts
index fcae0d2..7098f9f 100644
--- a/lib/googlecalendar.ts
+++ b/lib/googlecalendar.ts
@@ -1,5 +1,7 @@
 import { google } from 'googleapis'
+import { getBaseURL } from '../helpers/url';
 import { Booking } from '../db/booking'
+import { getDays } from '../helpers/date';
 
 const calendarId = process.env.GOOGLE_CALENDAR_ID
 let credentials: object
@@ -23,13 +25,21 @@ const calendar = google.calendar({
   auth,
 })
 
-export async function getNewEvents() {
+export async function getBookedDays() {
   const { data } = await calendar.events.list({
     calendarId,
     timeMin: new Date().toISOString(),
+    timeZone: 'utc',
   })
 
   return data.items
+    // ignore non all-day events
+    .filter(event => !!event.start.date)
+    .flatMap(event => getDays({
+      startDate: new Date(event.start.date),
+      endDate: new Date(event.end.date),
+      endDateExclusive: true
+    }))
 }
 
 function getSummary(booking: Partial<Booking>): string {
@@ -44,12 +54,18 @@ function getSummary(booking: Partial<Booking>): string {
   return summary
 }
 
+function getDescription(booking: Booking): string {
+  const bookingUrl = `${getBaseURL()}/admin/booking/${booking.uuid}`;
+
+  return `Managelink ${bookingUrl}`;
+}
+
 export async function createCalendarEvent(booking: Booking): Promise<Booking> {
   const response = await calendar.events.insert({
     calendarId,
     requestBody: {
       summary: getSummary(booking),
-      // TODO: description,
+      description: getDescription(booking),
       start: { date: booking.startDate },
       end: { date: booking.endDate },
     },
@@ -64,7 +80,9 @@ export async function deleteCalendarEvent(booking: Booking) {
   await calendar.events.delete({
     calendarId,
     eventId: booking.calendarEventId,
-  })
+    // TODO: really useful?
+    sendNotifications: true,
+  });
 
   booking.calendarEventId = null
 }