I would echo what Senusret said.
Also, I would in use the formal name of the fraternity at least once, and I would either embed a hyperlink to the national fraternity's webpage, like this:
"
Acacia Fraternity, the international social fraternity without Greek letters, will be recruiting prospective members on January 9 through 17."
or I would include a link to the national website at the bottom with other links.
I also think you need a stronger ending than "you are not committing yourself to anything by showing up" -- go with something more positive, like "Come see what we're all about" or "Come see what makes us different from the rest."