It’s good to see that people are finally ditching the use of paper and moving to a green world with the utilization of existing technology. SMS and email are good options for sending invitations to friends, family and acquaintances. The other benefit is that your message reaches instantly. I think this message could help:
“Welcome to the gracious presence of God by accompanying us on the occasion of Puja at our home.” You may also add “Please revert to confirm your presence at the Puja.” This will help you in making preparations for the guests. This method is also useful for making plans at quite a short notice. Can anyone suggest some more formal invitation wordings for sending SMS for Pooja?