Not a Beatles fan per se but we will be going to the museum as I like some of their music and I get their place in rock and roll history. I love York. Yorkminster and the Shambles are great sites. I think my 13 year old son will like the Viking museum. The last time we were there was a few weeks after 9/11 and there was a memorial set up outside of the cathedral with messages of support from "Old" York to New York. It was pretty touching. I definitely plan on stopping by Huddersfield's stadium too.
I would have loved to have been able to see a match but with the boy's school schedule and all, it just wasn't in the cards this year. I plan on taking the Anfield stadium tour. unfortunately, due to construction you aren't allowed in the Kop or on the pitch at this time. The Fenway Sports Group does a good job with the Fenway Park tours so I imagine they do well with the Anfield tours too.