I have invited brothers and sisters from the original branch to a party. How should I write my invitation message?

Winter and spring are passing by, and the cold and heat are suddenly changing. In a blink of an eye, we ** (** is the name of your company) brothers and sisters have not been together for a long time. The sunshine in front of ** (for time) is so bright, leaving a deep mark on our lives! We sincerely invite you to attend the party on the 1st of *month* of *year at a certain place. I believe that your arrival will make our gathering more meaningful and comfort our hearts that miss each other.