I regret that I never made a Beatles concert in my youth. My son is a huge Beatles fan and I find it interesting that the upcoming generation are fans of music from the 60's and 70's. My generation generally rejected our parents music as "square."
I've been to 4 McCartney concerts with my son, 2 in D.C. and most recently, one in Columbia, S.C. The most memorable was when my son and I traveled to Quebec for an outdoors show, to celebrate the city's 400th anniversary.