According to the paper, Ernesto Valverde will give his men holidays from 26th May. In other words, the day after the Copa del Rey final.
As is logical, it is expected that the players leave that same day. And taking into account that all players have to join their respective national teams on 3rd June, that seems to suggest there will not be any special party.
There are qualifying games for Euro 2020 and also for the Nations League. There is also the Copa America of course.
Valverde has got his whole week planned out. The coach wants his team to give it their all and win the Copa del Rey.
After that game, Valverde will give the Barca players time off. For the time being, there is no special party planned. It seems like if the fans want to celebrate it, they will have to do so without their players.