We present a dataset of mobile EEG recordings collected from audience members (N = 57) attending live dance performances. Across three days, each independent audience group viewed a contemporary dance performance for approximately one hour in a naturalistic theatre setting. This dataset is the first to present the simultaneous recording of wet-electrode EEG from > 15 individuals in a naturalistic environment. The public availability of this dataset may facilitate development of new pre-processing pipelines for mobile EEG collected with both naturalistic stimuli and in non-laboratory environments, and new tools for measuring inter-brain synchrony in large groups.