Read this and answer the question. If the question is unanswerable, say "unanswerable".

On the east side of the main park area is the National Museum of Visual Arts. On this side, a very popular street market takes place every Sunday. On the north side is an artificial lake with a little castle housing a municipal library for children. An area to its west is used as an open-air exhibition of photography. West of the park, across the coastal avenue Rambla Presidente Wilson, stretches Ramirez Beach. Directly west of the main park are, and belonging to Parque Rodó barrio, is the former Parque Hotel, now called Edifício Mercosur, seat of the parliament of the members countries of the Mercosur. During the guerilla war the Tupamaros frequently attacked buildings in this area, including the old hotel.

What takes part on the east side of the main park every Sunday?
a very popular street market