Formal:
* Wil jy dalk vanaand/môre aand by my kom eet? (Would you like to come over for dinner tonight/tomorrow night?)
* Ek wil jou graag uitnooi vir aandete by my huis vanaand/môre aand. (I would like to invite you for dinner at my house tonight/tomorrow night.)
Informal:
* Kom eet saam vanaand/môre aand by my. (Come over for dinner tonight/tomorrow night.)
* Ek maak vanaand/môre aand kos, wil jy nie kom eet nie? (I'm making dinner tonight/tomorrow night, would you like to come over?)
* Ek is besig om vanaand/môre aand iets lekker te maak, kom kuier gerus saam! (I'm making something delicious tonight/tomorrow night, feel free to come over!)
You can also add a detail about what you are making to make it more inviting:
* Ek maak vanaand/môre aand [gereg] - kom eet saam! (I'm making [dish] tonight/tomorrow night - come over for dinner!)
Remember to adapt the language to your relationship with the person you're inviting. You might also want to mention if you want them to bring anything, like a bottle of wine or dessert.