Suggest what you would do in the following situation:
One particular friend of yours is always late for college, social functions, movies, etc. and delays everyone.
If my friend is repetitively getting late and causing a delay for all the events and activities, I will offer help to pick him/her from home so that we reach the place on time. However, if the problem persists in spite of that, then I will have a talk with my friend to figure out if there is any other way to resolve it. I'd also make him/her realise how this habit would be detrimental in the long run.