Well, I wouldn't be one to judge whether you should shave for an event or not, not knowing anything about the event. However, if you had a very presentable beard, looking intentional and very well kept, I think you would have a much stronger argument to attend this event with that beard.

Your question is whether you will lose progress with a shave and of course, you lose this 6 months of progress.  Your beard will grow back just fine, so you must just weigh the setback of some time vs. peace at home. A good compromise would be to shave with the stipulation that you will not be shaving for any future events.  Even this proposal would go over better if it included a statement that you will be growing it out more intentional in the future.  Of course, you will be 19 next year and at that age it's high time your parents don't dictate your personal grooming choices.


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