I would say go for it too. You'll never be able to prep for absolutely every situation that can come up anyways, so you have to draw the line somewhere on how much the application cycle runs your life.
If there is a specific school that you know you are interested in, you could always call them and ask what their timetable is for interviews and such. Admissions offices are usually happy to give out that info. You could also apply to a few extra schools than your normally would too, just in case there are conflicts.
I will say that I traveled overseas during an application cycle and one school had only one interview day for all candidates, which happened to be while I was gone... It worked out though, because I will be attending a different school this fall that I am very happy with. I definitely feel like missing an interview due to travel was a fluke though as most schools will have multiple interview days available, usually over a span of multiple weeks that you can choose from. (My travel was in September, which is a much busier application time than July. So there would be less possibilities for conflict in July)
Bottom line, I'd say enjoy your trip as there are usually many ways around possible conflicts!