Let‘s have a party this Sunday.(保持句意) _____ _____ having a party this Sunday.是句号,不是问号

Let‘s have a party this Sunday.(保持句意) _____ _____ having a party this Sunday.是句号,不是问号
Let‘s have a party this Sunday.(保持句意) _____ _____ having a party this Sunday.
是句号,不是问号

Let‘s have a party this Sunday.(保持句意) _____ _____ having a party this Sunday.是句号,不是问号
what about 或者how about
你确定这个问题本身没错误么,是肯定句么

let is

How about having a party this Sunday.