During the two-day open day, 80 students and teachers from secondarry grammer schools and high schools visited our laboratory. Several attractions were prepared for the visitors, they could try themselves methods routinely used in a biological laboratory. DNA concentration was measured on the Nano Drop, samples were loaded on the gel and gram staining of bacteria was performed. On the top of that individual sections within the lab with all their instruments were presented and lecture about microbiome was held in the library.