michel_coworking/views/event_views.xml

<?xml version="1.0" encoding="utf-8"?>

<odoo>
<!-- Form -->
  <record id="view_form_event" model="ir.ui.view">
    <field name="name">Event Form</field>
    <field name="model">coworking.event</field>
    <field name="arch" type="xml">
      <form string="event">
        <sheet>
          <group name="group_top">
            <group name="group_left">
              <field name="title" />
              <field name="manager_id" />
              <field name="date_start" />
              <field name="date_end" />
              <field name="duration" />
              <field name="description" />
              <field name="statut" />
              <fiels name="participants_ids" />
            </group>
          </group>
        </sheet>
      </form>
    </field>
  </record>

  <!-- Tree -->
  <record id="view_tree_coworker" model="ir.ui.view">
    <field name="name">event Tree</field>
    <field name="model">coworking.event</field>
    <field name="arch" type="xml">
      <tree default_order="date_start asc, title asc">
        <field name="title" />
        <field name="manager_id" />
        <field name="date_start" />
        <field name="participants_ids" />
        <field name="statut" />
      </tree>
    </field>
  </record>

</odoo>