Yes. The point being that fèileadh mhòr implies that fèileadh is feminine, because mòr lenites to mhòr following a feminine noun, which is not the case here.

Gender can sometimes be inferred from the spelling of a word, particularly its' ending, but there are too many exceptions to formulate a set of 'rules'.

Those of us not fortunate enough to be native speakers just have to try to remember! - Robbie