Fork from the owncloud/calendar with Alarm/Reminder/Notifications.
cd apps
git clone https://github.com/ElieSauveterre/calendar.git
In ownCloud:
Enable the Calendar app.
If the oc_clndr_alarms does not exist after the install, you may manually create the table:
CREATE TABLE `oc_clndr_alarms` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`objid` int(10) unsigned NOT NULL DEFAULT '0',
`value` varchar(255) COLLATE utf8_bin NOT NULL,
`optionfield` varchar(1024) COLLATE utf8_bin NOT NULL,
`timetype` varchar(255) COLLATE utf8_bin NOT NULL,
`senddate` datetime NOT NULL DEFAULT '1970-01-01 00:00:00',
`type` varchar(255) COLLATE utf8_bin NOT NULL,
`sent` smallint(6) NOT NULL DEFAULT '0',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;