odoo16/addons/event_sale/data/event_demo.xml

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

    <record id="event.event_0_ticket_0" model="event.event.ticket">
        <field name="product_id" ref="product_product_event"/>
        <field name="price">0</field>
    </record>
    <record id="event.event_0_ticket_1" model="event.event.ticket">
        <field name="product_id" ref="product_product_event_standard"/>
        <field name="price">1000.0</field>
    </record>
    <record id="event.event_0_ticket_2" model="event.event.ticket">
        <field name="product_id" ref="product_product_event_vip"/>
        <field name="price">1500.0</field>
    </record>

    <record id="event.event_2_ticket_1" model="event.event.ticket">
        <field name="product_id" ref="product_product_event_standard"/>
        <field name="price">1000.0</field>
    </record>
    <record id="event.event_2_ticket_2" model="event.event.ticket">
        <field name="product_id" ref="product_product_event_vip"/>
        <field name="price">1500.0</field>
    </record>

    <record id="event.event_4_ticket_0" model="event.event.ticket">
        <field name="product_id" ref="product_product_event_standard"/>
        <field name="price">99.0</field>
    </record>

    <record id="event.event_7_ticket_1" model="event.event.ticket">
        <field name="product_id" ref="product_product_event_standard"/>
        <field name="price">0.0</field>
    </record>
    <record id="event.event_7_ticket_2" model="event.event.ticket">
        <field name="product_id" ref="product_product_event_vip"/>
        <field name="price">0.0</field>
    </record>

</odoo>