Premier Mark McGowan has been forced to defend his decision to attend a lavish Penfolds Grange wine tasting dinner at the Peppermint Grove mansion of millionaire property developer Nigel Satterley.

Premier Mark McGowan has been forced to defend his decision to attend a lavish Penfolds Grange wine tasting dinner at the Peppermint Grove mansion of millionaire property developer Nigel Satterley.