"Is grass hockey the "normal" hockey? Which days do they play and time?"
It depends on which corner of the globe you hail from. In North America ice hockey is the 'normal' one, played on ice with a puck instead of a ball. In the rest of the world I guess grass hockey (played on grass with a ball and those short skirts) is the 'normal one.'
As for Masukuma's 'hockey grounds near city market' and my 'Gymkhana,' I think the difference is the same. Try weekends
"The opposite of a correct statement is a false statement. But the opposite of a profound truth may well be another profound truth." (Niels Bohr)