Hi John. Chords, licks, etc., I keep in my head - I don't read dots. Lyrics we do the old way, sheets in binders.
We rotate 12 different 1-hour sets for our seniors' gigs, and never do one venue any more than four times per year. That way, say we do Set 1 at a gig in January 2016, well then it will be January 2019 before we use Set 1 again at that venue - having gone through the remaining eleven sets in that three year period.
We make a note of which set we did at any given venue so we know which set we'll be doing on the next visit.