Name of recipient:
I hope all of you are doing well. How is the weather in (name of place)? We are also enjoying our spring break and having a good time. I wish to invite you for (name of person) birthday party, which falls on (date). The party will be held at (venue) from (time) to (time). We request you to attend the party along with your family as this will make (name) very happy.
Besides the party, which is there in the evening, we also have a magic show for the children which will be held during the party. I am sure the children will have great fun in watching this. We are also going to keep a theme of the party, that is (name of theme). It will be nice if you make the kids dressed according to the theme as they will enjoy being part of it.
Hope to see you soon.