In Forza Horizon 4, to unlock the Ambleside Rush cross-country event, you need to progress through the game's Festival progression. More specifically, you will need to complete the prerequisite events for the cross-country series and reach a certain tier in the Festival.
Here’s a step-by-step guide:
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Progress through the Horizon Story: Complete different showcase events and other festival activities to level up your Horizon Adventure.
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Complete Previous Cross Country Events: Make sure to complete the earlier cross-country events available in the game. This will make the Ambleside Rush cross-country event available to you.
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Reach a Specific Festival Level: Often, unlocking events requires you to reach a certain level in your festival progression.
Once you've fulfilled these requirements, you should be able to access the Ambleside Rush event on the map. Good luck and have fun racing!