odoo-event-addons/event_type_description/views/event_event.xml

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

  <record id="view_event_form_inherit_event_type_description" model="ir.ui.view">
    <field name="name">event.event.view.form.inherit</field>
    <field name="model">event.event</field>
    <field name="inherit_id" ref="event.view_event_form" />
    <field name="arch" type="xml">
      <field name="active" position="after">
        <field name="can_pull" invisible="1" />
      </field>
      <notebook position="inside">
        <page name="description" string="Website description"
          groups="event.group_event_manager,website.group_website_restricted_editor">
          <group>
            <button type="object" name="pull_type_description" colspan="2"
              string="Update this event description from template"
              class="btn-secondary btn-sm" icon="fa-download"
              attrs="{'invisible': [('can_pull','=',False)]}" />
          </group>
          <field name="description" />
        </page>
      </notebook>
    </field>
  </record>

  <record id="event_event_action_server_type_description" model="ir.actions.server">
    <field name="name">Push template description</field>
    <field name="model_id" ref="event.model_event_event" />
    <field name="binding_model_id" ref="event.model_event_event" />
    <field name="groups_id"
      eval="[(6, 0, [ref('event.group_event_manager'), ref('website.group_website_restricted_editor')])]" />
    <field name="state">code</field>
    <field name="code">record.push_type_description()</field>
  </record>

</odoo>