Seems like we need this to make notifications and widget updates receiver work.

            android:theme="@android:style/Theme.Holo.Dialog" />

        <receiver android:name="com.android.calendar.alerts.AlertReceiver"

            android:exported="false">

            android:exported="true">

            <intent-filter>

                <action android:name="android.intent.action.EVENT_REMINDER" />

                <action android:name="android.intent.action.TIME_SET" />

                  android:exported="false" />

        <receiver android:name="com.android.calendar.UpgradeReceiver"

            android:exported="false">

            android:exported="true">

            <intent-filter>

                <action android:name="android.intent.action.BOOT_COMPLETED" />

                <category android:name="android.intent.category.DEFAULT" />

        <!-- Declarations for the widget -->

        <receiver android:name="com.android.calendar.widget.CalendarAppWidgetProvider"

            android:exported="false">

            android:exported="true">

            <intent-filter>

                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />

                <action android:name="com.android.calendar.APPWIDGET_UPDATE" />

        </receiver>

        <receiver android:name="com.android.calendar.widget.CalendarAppWidgetService$CalendarFactory"

            android:exported="false">

            android:exported="true">

            <intent-filter>

                <action android:name="android.intent.action.TIMEZONE_CHANGED"/>

                <action android:name="android.intent.action.DATE_CHANGED"/>