Send the message like a week before June 21st because theres a chance that if you send it now people may forget. Do a group message of all the people youre inviting and just give them the basics for example, "Hey guys! i'd love for you to come to my bday party! Its at Red Robin on June 21st starting at 6. Hope to see you there!"

...Might want to wait until it's closer to June 21 to send out a text message, or they might forget in two weeks. But just say what you said here "I'm having a dinner celebrating my birthday on June 21 at Red Robin's."

So my birthday dinner is on June 21 , at this place called red robin ..... But I need help sending out the text message to people so they know about it .... It starts at 6 . Can someone help me on what to say ??!!!!