The biannual International Conference series LACONA is focused on advances in photonic techniques for diagnostics and conservation-restoration of cultural heritage which will be held in Florence on September 14-18, 2020, with the aim of strengthening and enriching the tradition of the Conference by encouraging the submission of contributions on the most advanced photonic tools and methods, their rigorous validation, and exemplary applications in safeguarding cultural heritage. Programme and useful information are available at the conference link lacona13