The Gait Inn is a traditional pub that serves good beer and good pub grub. The last time I visited I recall I had a decent pint produced by York Brewery although I don't recall the specific name. Millington itself is a good starting point for several walks around that part of the Yorkshire Wolds.
A long walk and a trip to the beer festival to sample a few sounds like a good idea to me. Time to get that one in the diary. I expect it will be well worth a visit if you've got the time.