When I go on a trip, I always pack my bags the night before, especially if it is an early morning flight. I will always have everything ready to go because I want to be at the gate on time. I don't want to miss my flight, so I prepare in advance.
That is the idea Jesus was communicating when He said, "Let your waist be girded and your lamps burning; and you yourselves be like men who wait for their master, when he will return from the wedding, that when he comes and knocks they may open to him immediately" (Luke 12:35–36).
In other words, have your walking shoes on and be ready to go.
To be ready for the return of Jesus is to be engaged in activities you would not be ashamed of if He were to return. It is a good thing to ask yourself periodically, This place that I am about to go, this thing that I am about to do—would I be embarrassed or ashamed to be doing this if Jesus were to come back?
If the answer is yes, then don't do it. If you can't pray over your plans for the evening, then don't do those things. You should be able to say, "Lord, bless our time at dinner. Lord, bless our time as we go here or there or as we do this or do that." If you can't, then don't do it.
First John 3:2–3 says, "We know that when He is revealed, we shall be like Him, for we shall see Him as He is. And everyone who has this hope in Him purifies himself, just as He is pure."
If we really believe that Jesus is coming, it should cause us to live godly lives.