odoo16/addons/website_event_exhibitor/security/security.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo noupdate="1">

    <record id="event_sponsor_rule_share" model="ir.rule">
        <field name="name">Event Sponsor: public/portal sponsor or published only</field>
        <field name="model_id" ref="website_event_exhibitor.model_event_sponsor"/>
        <field name="domain_force">[('website_published', '=', True)]</field>
        <field name="groups" eval="[(4, ref('base.group_public')), (4, ref('base.group_portal'))]"/>
        <field name="perm_read" eval="True"/>
        <field name="perm_write" eval="False"/>
        <field name="perm_create" eval="False"/>
        <field name="perm_unlink" eval="False"/>
    </record>

</odoo>