I'm with Will on this and we do just what he does.
We're not being paid to entertain and the landlords are very grateful for our custom and the custom of those who come to listen.
I've played a huge number of paid pub/club gigs and I expected then to entertain the crowd, but a session in my view is for the musicians and any benefit to others is incidental.
A session gives musicians a chance to get together at an appropriate level and enjoy playing along with lots of other people, rather than sitting dumbly through many (often lacklustre) solo performances.

And, Morris-ey, our local landlord loves it....