The Geometrical Seminar is traditional conference which started its activities during the eighties in the last century, under the name Yugoslav Geometrical Seminar. The last conference, 19th Geometrical Seminar, which took place at Zlatibor 2016, had over 120 participants from more than 25 countries.  The aim of these meetings is to bring together mathematicians, physicists and engineers interested in geometry and its applications, to give lectures on new results, exchange ideas, problems and conjectures.