Time evolution of the noise level in restaurant Club Shupitoo on Thursday (a), Wednesday (b) and Monday (c). The sound pressure level values are depicted in grey and the number of people present in pink. The acoustic capacity N_max = 24 and is indicated by the black dashed line. In the bottom right panel, the difference L_A,eq – L_P,tot is plotted depending on the number of theoretically active sound sources, i.e. half of the persons present (d).