<macro name="event">
    <choose>
      <!-- Published Conference Paper -->
      <if type="paper-conference speech" match="any">
        <choose>
          <if variable="container-title" match="any">
            <group delimiter=" ">
              <text term="in" text-case="capitalize-first" />
              <text variable="container-title" font-style="italic"/>
            </group>
          </if>
          <!-- Unpublished Conference Paper -->
          <else>
            <group delimiter=" ">
              <text term="presented at"/>
              <text variable="event"/>
            </group>