MEXICO CITY – American photographer Spencer Tunick said Sunday he was hoping to draw his largest crowd of nude people for a shoot next month in Mexico City’s enormous Zocalo plaza.

Tunick, famous for photographing crowds of nude people around the world, said the May 6 shoot could be bigger than one he did in 2003 with 7,000 volunteer models in Barcelona, Spain.

The historic Zocalo plaza measures about 21,000 square yards – the size of about five football fields – and can fit up to 85,000 people standing.

Tunick said last month that 3,700 participants had registered for the shoot. On Sunday, he said more were signing up but declined to give a figure.