For myself, I'm pretty much business 24/7. Parents can always text/email/call me and I just choose when I want to respond. In this case, I'd do interviews now if I wasn't busy but limit them to 30 minutes and make sure parents know this...."your interview is on Wednesday from 10-1030. Please don't be late as this will cut into our time"

If it's a problem and you don't want to be bothered, I'd just adjust your ad to say that you're currently on holidays and not taking business calls. Let them go to voicemail and respond when you want too. You can also adjust your voicemail to say you're on holidays and will return calls when you're back to work