请帮我看看这篇英语作文是否有语法的错误,如有请指出,
MyFavouriteFestival
MyfavouritefestivalisMid-AutumnFesitival.ItusuallycomesinAugustorSeptember.Onthatday,Ioftenhaveabigdinnerwithmyfamilymembers.Afterdinner,wegoouttowatchthemoon.Sometimesweuseatelescopetowatchuit.Onthatday,wearenotonlywatchthemoonbuthavebarbecueaswell.IreallyenjoymyselfatMid-AutumnFestival.