The timeline is 2 days after that Bakugo and Deku got accepted to UA

At Izuku's house

Inko: "IZUKUUU"

Izuku: Come out of his bedroom "What is it mom, you seem exited?"

Inko: "Pack your things, tomorrow we're going in a plane to Malibu with Mitsuki, Masaru and Katsuki to celebrate your admission at UA!!"

Izuku: mumble "Vacation? With Kacchan?..."