pull events

// get all events
$event_data = $this->get_content( $endpoint, $after );

// single event (make into array)
if ( $event_id && isset( $event_data[ 'activity' ] ) ) {
    $event_data[ 'activities' ][] = $event_data[ 'activity' ];
}
// all events (incl. single)
if ( isset( $event_data[ 'activities' ] ) && ! empty( $event_data[ 'activities' ] ) ) {
    foreach( $event_data[ 'activities' ] as $event ) {
        if ( isset( $event[ 'activityID' ] ) && 'Oefenruimte' != $event[ 'title' ] ) {
            $endpoint          = $this->determine_endpoint( $event[ 'activityID' ] );
            $single_event_data = $this->get_content( $endpoint );

            if ( isset( $single_event_data[ 'activity' ] ) ) {
                $event_values         = $single_event_data[ 'activity' ];
                $description_endpoint = $this->determine_endpoint( $event[ 'activityID' ], 'information' );
                $description_data     = $this->get_content( $description_endpoint );
                $image_endpoint       = $this->determine_endpoint( $event[ 'activityID' ], 'images' );
                $image_data           = $this->get_content( $image_endpoint );

                if ( isset( $description_data[ 'info' ][ 'shorttext' ] ) ) {
                    $event_values[ 'shorttext' ] = $description_data[ 'info' ][ 'shorttext' ];
                }

                if ( isset( $description_data[ 'info' ][ 'longtext' ] ) ) {
                    $event_values[ 'longtext' ] = wp_kses( $description_data[ 'info' ][ 'longtext' ], 'data' );
                }

                if ( isset( $image_data[ 'images' ] ) ) {
                    $event_values[ 'images' ] = $image_data[ 'images' ];
                }
                $all_event_data[] = $event_values;
            }
        }
    }
}