How drunk is too drunk?

This kind of situation is something that is extremely fuzzy to define, but has some easy implications for how people should be taught to handle the situation.

If you are drinking, know your judgement is impacted. The same applies for others.

If you know someone is not normally interested in you, assume they will still feel the same when they sober up and don't try anything while they are drunk.

If you are interested in a stranger while drunk, know your judgement is impacted and you are likely to misread cues so error on the side of caution. Better to miss an opportunity than to completely misread their intentions or miss signs that they are past their ability to make decisions.

Past that, aim for obvious signs of consent because once again, you are drunk and will probably misread their nonverbal cues.

To be honest the best outcomes came from listening to good friends who recommended for or against hooking up with someone because they were not the one looking to get some.