I think Gideon is bonding with Ireland so that could be used as cover up for him to see Eva..! However don't forget that Gideon does own a share of Vidal records, and he knows Brett's band is signed with them, throwing some type of party would maybe include Brett's being there so if Eva is seen with Brett and somehow it leaked that she's the "golden" girl then it only would strengthen the "ploy" that they are not together.! So maybe the party was a plan..!!
It just doesn't seem like Gideon would appreciate Eva being in the same place as Brett if it wasn't going to benefit them..! Hence why he didn't go to the restaurant when Brett showed up at the crossfire and him and Eva went to lunch, he could have easily had security escort him out the building before Eva even got downstairs. That was a benefit for the both of them, for her to be seen with another man other than Cary..!!
And now that I think about it, Eva did stop the google alerts so that first snapshot may be breaking news from the press that Eva was seen with Brett. She did say she took him to the place her and Cary was photographed at and it was all over the papers!