Seasons
Allow temporary relevance to start and end automatically.
Seasonal logic works better when data, campaigns and ranking are managed when one time-related package is managed.
Pre-planning
Set start, peak and finish point in advance.
Stock
Allow current availability to remain leading.
Query sets
Test seasonal queries before going live.
Local differences
A season or holiday can be different per market.
Afterward
Remove boosts and analyze what can be learned structurally.