flectra/addons/event/report/event_event_reports.xml

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

    <record id="paperformat_euro_lowmargin" model="report.paperformat">
        <field name="name">European A4 low margin</field>
        <field name="default" eval="True"/>
        <field name="format">A4</field>
        <field name="page_height">0</field>
        <field name="page_width">0</field>
        <field name="orientation">Portrait</field>
        <field name="margin_top">5</field>
        <field name="margin_bottom">5</field>
        <field name="margin_left">5</field>
        <field name="margin_right">5</field>
        <field name="header_line" eval="False"/>
        <field name="header_spacing">0</field>
        <field name="dpi">80</field>
    </record>

    <report
        id="report_event_registration_badge"
        model="event.registration"
        string="Registration Badge"
        report_type="qweb-pdf"
        name="event.event_registration_report_template_badge"
        file="event.event_registration_report_template_badge"
        paperformat="event.paperformat_euro_lowmargin"
        print_report_name="'Registration Event - %s' % (object.name).replace('/','')"
    />

     <report
        id="report_event_event_badge"
        model="event.event"
        string="Event Badge"
        report_type="qweb-html"
        name="event.event_event_report_template_badge"
        file="event.event_event_report_template_badge"
        menu="False"
        paperformat="event.paperformat_euro_lowmargin"/>

</flectra>