General objectives of the stage: Great Balls of Fire is the only stage of seventh game mission, Welcome to Hope. The main objective is to cross the bar in order to get to a person with information on Lenny. This task can be obtained in two main ways and one of them is avoiding of upsetting local guests.
If you want to get to the bartender without a fight then your first task is to figure out how to get to the largest bar room. Keep away from two main entrances because they are watched by bouncers. Instead of that use the side passage to toilets shown on the above screen.
After getting to the toilets, you have to decide how to behave there. One possible method is to neutralize a cop in order to get Hope police officer disguise. Watch out on higher difficulty levels because you might encounter two persons instead of one in the toilets. In such case try to stun both policemen especially that there is no cabinet or crate around, where you could hide a body of first of them.
When you have Hope police officer disguise, you can return to the starting room and then enter the main bar area with no problems, not worrying that someone may identify you.
Another method is using the ventilation shaft shown on the above screen. Its entrance is located in the toilet.
The ventilation shaft will lead you to a small room, where you have to look around carefully finding evidence. Now you can go to the door leading to the main bar area.
If you do not use any disguise, prepare for much more difficult situation, because you have to avoid not only policemen but also bouncers and truck drivers. If you have Hope police officer disguise, you have to only watch out for other cops. Look out for two policemen standing next to the stairs leading to the bar. You can try to distract them by throwing bottles or sneak past them using Instinct.
But that's not the end yet, because in the last part of the bar you'll encounter more persons which should be avoided, including two officers sitting at one of the tables. Try to reach the bartender as fast as possible and press interact key/button to question this character.