Here are samples of SMSes you can send as an invitation for your enagagement ceremony:

We will be surely delighted by your presence on the party celebrating the engagement of my son.

As two families unite, I gladly invite you to join us on a special night featuring engagement of Bob and Charlie.

We heartily request the honor of your company at a lunch party celebrating the engagement ceremony of my daughter.

Your best wishes and blessings would surely lend a happy future to the newly bonded couple. We therefore request your company on a dinner party celebrating the engagement of George and Martha.

We request you for your gracious presence on an auspicious occasion celebrating the engagement of my daughter, Jenny.

This in to inform you that next Thursday we are celebrating the engagement ceremony of Franz and Kelly. Kindly mark your presence to grace the night