If you are a girl, I wouldn’t recommend going to a house of a superior or anyone with power over you. They expecct you to be weak and might want to use that against you. Regardless of their succes, best case scenario means nothing positive or negative happens. Worst case scenario should be obvious. If you are under the legal drinking age, I strongly recommend against drinking alcohol around “strangers” (meaning people who aren’t friends or family). Also, how many others are coming. If he invited just you, it’s trouble. If he invited an entire office, there is a huge chance that he expects you not to come (as you are very young and you’d be forbidden to go to a stranger’s house at night if you have caring parents). In other words, unless you become an adult, I strongly recommend against going to a house of your superior at night even if there are other people and no alcohol is involved. If he invited the entire office and his gf/wife for a tea party during afternoon/early evening, got for it and nothing else.
A criminal record is forever. Now pardons can be granted and records sealed, but the record that a person was tried and convicted of driving under the influence will always exist. Depending on the circumstances, other law may prevent the conviction from being taken into account after a pardon, expungement or record suspension. However, in areas like immigration, questions are often phrased “Have you ever…“ which means that the conviction must be disclosed, even after a pardon or other legal act of forgiveness has been granted. I drank 16 shots In airborne school when I was 19 yrs old, puked all the way back to the barracks but I did my pushups past every airborne unit sign like I was supposed to, I “won” the drinking contest at the EM club. Next morning I got up at 4 am and did PT and my training, was ok. But to this day I cannot drink tequila or even stand the smell of it, kinda like I am allergic to it. Oh, BTW I had a bleeding ulcer in my stomach at the age of 27 the size of a dime nearly killed me. So I do not drink any hard liquer anymore, just beer.