As admin, enable "Mobile services": Site administration ► Mobile app ► Mobile settings Create a new Top category on the site Create a new course inside that category Enrol a user as student in that new course As admin create a category calendar event (for tomorrow) in the new category created in step 2 (via the Calendar block or via the flat menu link). Now create a site event (for tomorrow) Create a Token in the mobile app service for the user used in step 4: Click on Site administration ► Plugins ► Web services ► Manage tokens Next, you can do a CURL REST call simulating a WS client with the user. You need to replace the wstoken with the token created for the user, courseid with the new course created one and the URL of your moodle instance curl 'http://localhost/m/stable_master/webservice/rest/server.php?moodlewsrestformat=json' --data 'options [userevents] =0&options [siteevents] =0&moodlewssettingfilter=true&moodlewssettingfileurl=true&wsfunction=core_calendar_get_calendar_events&wstoken=12a2a65aeea2a177055e233f9e303218&events [courseids] [0] =23' --compressed | python -m "json.tool" Check that you receive the category event created for the new category and that the caterogyid returned matches with the new category created id Now, remove the following from the curl request "options [userevents] =0&options [siteevents] =0&" and execute the request again Check that you also receive the Site event and that the categoryid field is set to 0