odoo16/addons/event_sale/data/event_sale_data.xml

<?xml version="1.0" encoding="utf-8"?>
<odoo>
    <data noupdate="1">
        <record id="product_category_events" model="product.category">
            <field name="parent_id" ref="product.product_category_1"/>
            <field name="name">Events</field>
        </record>

        <record id="product_product_event" model="product.product">
            <field name="list_price">30.0</field>
            <field name="standard_price">10.0</field>
            <field name="uom_id" ref="uom.product_uom_unit"/>
            <field name="uom_po_id" ref="uom.product_uom_unit"/>
            <field name="name">Event Registration</field>
            <field name="description_sale" eval="False"/>
            <field name="invoice_policy">order</field>
            <field name="categ_id" ref="event_sale.product_category_events"/>
            <field name="detailed_type">event</field>
        </record>
    </data>
</odoo>