Craig: Do you have the remote sensor for the 522. If so, take that hammer head off the camera and use that. If not, raise the flash above camera height on the bracket if you can. I've used an Auto 522 for many years and exposure, dialed in as per film box works well. Apertures of f8 or f5.6 and you just have tp compose and fire. Stick with one aperture if you can - the less you have to worry about in a fast-paced environment like this the easier it is to ensure you get all the shots you want and need.
Outdoors, fill flash - I just set the film speed on the sensor at one stop faster than the film. Meter separately and set the appropriate aperture on the sensor.
If you do the B&W - I'd use the same technique. Indoors, the "harsh" lighting was pretty de rigeur 50 years ago, so the match should be good.
Finally, don't bother with one of those diffusing thingys. They don't soften the light, because they don't increase the size of the light source. All they do is reduce light output.
Make the technical stuff as simple as possible - that way you can concentrate on the photographs. Enlist the girlfriend to point out shots for you. She knows the family, who hasn't seen who in a while etc. She also knows her parents better than you and will know whatshots they want or would like.
Finally, get the shooting done as early as possible. This will leave you more time to get to the bar!!!
