HS graduation parties were a big deal in my cong. I of course was not allowed to have one because I had an "unbelieving" father (my mother's excuse). I was given a congratulatory card and instructed to appear at my cousin's grad party on the same day. My mom apparently changed her mind when it was time for my younger sibs to graduate; they had big catered parties with hundreds of guests (and they got cars as a gift).
....Yes, I am still bitter.