If it is a project management or a project board meeting and if the dinner is necessary for networking among the consortium partners andis necessary to conduct the project, yes, it is possible to claim it on the project. But it needs to be justified for networking issues. Best advice is to ask the Project Officer in advance if the costs for a common dinner will be covered by the project. It is always good to have an agenda so you really can show that the dinner was a working dinner and not for entertainment.