Normally when Tangren have the booting conference/ceremony it would be the city where they would be filming the next day. So from this posted by H.Ge-C.liu, it could mean that the conference will be in XiangShan or Hengdian (both their filming sites).
DMY:
-Karen will be flying to XiangShan to get the first wave of costumes ready, and to prepare for the press conference.