请专业认识来看一下这段话中有哪些语法错误，指出并帮忙改正，谢谢！

It is a Black Friday today, believe it or not, it's a bad day indeed even if I didn't believe it before, so I hung out, then I found I forgot to take my purse with me when I was in cinema, so I missed the movie. Never go out again on Black Fridays.
写作功底还不错，注意下句子间的逻辑关系就行。