If there is major conflict, a major obstacle or problem to overcome, as there is in most genres, every scene likely has either foreground or background conflict. Even a picnic scene is going to be colored by the major conflict of the story.

When life and death events are happening, people do not simply forget about them when they go off on a picnic. The mood and tone of the scene will still reflect the major conflict. The conflict will still be in the character's thoughts, in their movements, in the way they relate to each other.

My own view is that every scene, whether a picnic scene, a love scene, a sex scene, a humorous scene, a character development scene, or whatever, should still be touched by the conflict. Regardless of the scene, the conflict should be there, if only as background radiation.