Who attends dinner at the Gargerys’ house? What is funny about the dinner scene? About the scene when Joe and Pip go to church?

Mr and Mrs Hubbs/ Mr Wopsle/ Mr Pumblechook

At dinner, humor might be found in Mr Pumblechook getting sick on the brandy..... Pip had replaced the brandy with tar-water.

At church....... I believe the only humor to be found here (and I wouldn't consider it humor) is Pip's argument with himself about whether or not to confess.