diff --git a/calendar/js/et2_widget_daycol.js b/calendar/js/et2_widget_daycol.js
index c9c44763c0..1eb34f05ee 100644
--- a/calendar/js/et2_widget_daycol.js
+++ b/calendar/js/et2_widget_daycol.js
@@ -1063,6 +1063,8 @@ var et2_calendar_daycol = (function(){ "use strict"; return et2_valueWidget.exte
 	 */
 	click: function(_ev)
 	{
+		if(this._parent.options.readonly ) return;
+
 		// Drag to create in progress
 		if(this._parent.drag_create.start !== null) return;
 
diff --git a/calendar/js/et2_widget_event.js b/calendar/js/et2_widget_event.js
index fd5b87837f..6cb40f1f69 100644
--- a/calendar/js/et2_widget_event.js
+++ b/calendar/js/et2_widget_event.js
@@ -958,7 +958,7 @@ et2_calendar_event.owner_check = function owner_check(event, parent, owner_too)
 	{
 		options = parent.getArrayMgr("sel_options").getRoot().getEntry('owner');
 	}
-	if(event.participants && parent.options.owner)
+	if(event.participants && parent.options.owner.length > 0)
 	{
 		var parent_owner = jQuery.extend([], typeof parent.options.owner !== 'object' ?
 			[parent.options.owner] :
diff --git a/calendar/js/et2_widget_timegrid.js b/calendar/js/et2_widget_timegrid.js
index 22df041a02..6ac61fbe5b 100644
--- a/calendar/js/et2_widget_timegrid.js
+++ b/calendar/js/et2_widget_timegrid.js
@@ -132,7 +132,7 @@ var et2_calendar_timegrid = (function(){ "use strict"; return et2_calendar_view.
 	destroy: function() {
 
 		// Stop listening to tab changes
-		if(framework.getApplicationByName('calendar').tab)
+		if(typeof framework !== 'undefined' && framework.getApplicationByName('calendar').tab)
 		{
 			jQuery(framework.getApplicationByName('calendar').tab.contentDiv).off('show.' + this.id);
 		}
@@ -164,7 +164,7 @@ var et2_calendar_timegrid = (function(){ "use strict"; return et2_calendar_view.
 		this._super.apply(this, arguments);
 
 		// Listen to tab show to make sure we scroll to the day start, not top
-		if(framework.getApplicationByName('calendar').tab)
+		if(typeof framework !== 'undefined' && framework.getApplicationByName('calendar').tab)
 		{
 			jQuery(framework.getApplicationByName('calendar').tab.contentDiv)
 				.on('show.' + this.id, jQuery.proxy(
@@ -1276,6 +1276,9 @@ var et2_calendar_timegrid = (function(){ "use strict"; return et2_calendar_view.
 	 * @param {type} actionLinks
 	 */
 	_init_links_dnd: function(mgr,actionLinks) {
+
+		if (this.options.readonly) return;
+		
 		var self = this;
 
 		var drop_link = mgr.getActionById('egw_link_drop');
@@ -1788,6 +1791,7 @@ var et2_calendar_timegrid = (function(){ "use strict"; return et2_calendar_view.
 	click: function(_ev)
 	{
 		var result = true;
+		if(this.options.readonly ) return;
 		
 		// Drag to create in progress
 		if(this.drag_create.start !== null) return;
@@ -1875,6 +1879,8 @@ var et2_calendar_timegrid = (function(){ "use strict"; return et2_calendar_view.
 	_mouse_down: function(event)
 	{
 		if(event.which !== 1) return;
+
+		if (this.options.readonly) return;
 		
 		var start = jQuery.extend({},this.gridHover[0].dataset);
 		if(start.date)
@@ -1951,6 +1957,7 @@ var et2_calendar_timegrid = (function(){ "use strict"; return et2_calendar_view.
 	 */
 	_mouse_up: function(event)
 	{
+		if (this.options.readonly) return;
 		var end = jQuery.extend({}, this.gridHover[0].dataset);
 		if(end.date)
 		{
diff --git a/calendar/js/et2_widget_view.js b/calendar/js/et2_widget_view.js
index 109e089040..acd1f7186d 100644
--- a/calendar/js/et2_widget_view.js
+++ b/calendar/js/et2_widget_view.js
@@ -151,6 +151,8 @@ var et2_calendar_view = (function(){ "use strict"; return et2_valueWidget.extend
 		else if(typeof new_date === "string")
 		{
 			this.date_helper.set_year(new_date.substring(0,4));
+			// Avoid overflow into next month, since we re-use date_helper
+			this.date_helper.set_date(1);
 			this.date_helper.set_month(new_date.substring(4,6));
 			this.date_helper.set_date(new_date.substring(6,8));
 		}
@@ -190,6 +192,8 @@ var et2_calendar_view = (function(){ "use strict"; return et2_valueWidget.extend
 		else if(typeof new_date === "string")
 		{
 			this.date_helper.set_year(new_date.substring(0,4));
+			// Avoid overflow into next month, since we re-use date_helper
+			this.date_helper.set_date(1);
 			this.date_helper.set_month(new_date.substring(4,6));
 			this.date_helper.set_date(new_date.substring(6,8));
 		}