Genshin Impact’s “Sunny Summer Fontinalia” event begins on July 1, 2026, as part of Version Luna VIII, and the official event page says it’s a limited- time event tied to that update. I can’t verify the exact end date from the information available here, but it’s not a permanent event and should last for the usual event window during the update.

What’s confirmed

  • Start date: July 1, 2026.
  • It is a special event connected to the new version update and the Fontinalia Film Festival content.

What that means in practice

  • You should expect it to run for a few weeks, not just a day or two, based on how Genshin version events are typically structured.
  • The exact duration may differ between the main event and any related sub-events.

Quick answer

For now, the safest answer is: it starts July 1, 2026, and is a multi-week limited event, but the exact end date isn’t confirmed in the information I have.