I recommend the following styles for inviting guests to dinner:

Dear [name/position of invitee], thank you for your continuous support and concern.

I want to invite you over for dinner and chat. I hope you can visit [the place] on [date].

Dear [name/position of invitee], how are your work/study recently?

I want to share some bits and pieces of my life with you. Please come to [the place] for dinner.

Dear friend, how have you been recently? I want to get together with you, enjoy delicious food and chat together.

Please visit [location] on [date].