Ask HN: Reference datasets for geolocated crowd behavior

I'm particularly interested in "egress bottleneck" situations like stadiums, nightclubs, etc.

There's a lot of literature on estimating crowd dynamics at a density level from video, but I don't have the hardware or budget for that; also the density-level outputs might not be enough to study emergent behavior. There's also a lot of older literature including sociology, etc. but I can't find a reference dataset for research -- however poor it is, finally.