"Evangelism" is a poor excuse to patronize a Hooter's. The most powerful witness that a Christian man can give to a Hooter's is to not be there. The absence of a Christian from Hooter's and his refusal to go says much more about the power of God unto salvation than his presence. In fact, his presence, at best, sends a mixed message.
Besides, people who patronize a Hooter's buy their groceries somewhere. The bank somewhere. They get their hair cut somewhere. There is no shortage of opportunity for evangelizing Hooter's patrons in everyday life without sacrificing personal holiness and going into Hooter's.
Of course, if one is really serious about evangelizing in Hooter's, send a women's group. My wife would have a few things to say to them. There are many alternatives to sending Christian men into Hooter's who have no business being there. The fact that these groups won't consider them speaks volumes as to their real purpose.
Also, consider the business aspect of this from Hooter's perspective. If these types of "Bible Studies" had any chance of being successful at evangelizing, do you really think Hooter's would allow them to take place? If they were successful, it would cost them customers. They want more customers, not fewer, and that is exactly what these Bible studies would produce.
In short, these people aren't really interested in attending a Bible Study at Hooter's. They are interested in attending Hooter's and using a pretend Bible Study to justify their ludeness, thumb their noses at the church, and bring reproach to the name of Christ.
At best, it is a poor error in judgment.