You probably already use a mail signature with your contact information. Use your mail signature to market your participation at the expo by inserting the web banner into your e-mail signature.
Use the social media:
HI Tech & Industry Scandinavia follows / likes your company profiles on social media, so it would be nice if you also follow HI's profiles.
Follow us on Facebook and LinkedIn. Use the platforms to discuss professional questions and/or to generate general attention about your expo participation, such as product news, stand activities and similar.