A 
Feast adds for the duration of 1 month (60 seconds):
+2 Happiness- flat production bonus: +2
Food, +2 
Wood, +2 Lore, +2 Kröwns - percentage production bonus: +20% Food, +20% Wood, +20% Lore, +20% Kröwns
Additionally you gain 
+20 Fame for organising one.
You need Food to start a feast.
Prices
Each feast is approximately 50% more expensive than previous one.
| Feast No. | Price |
|---|---|
| # 1 | 100
|
| # 2 | 150
|
| # 3 | 220
|
| # 4 | 330
|
| # 5 | 500
|
| # 6 | 750
|
| # 7 | 1,130
|
| # 8 | 1,700
|
| # 9 | 2,560
|
| # 10 | 3,840
|
| # 11 | 5,760
|
| # 12 | 8,640
|
Tips and Tricks
- Do not feast during winter, or even worse, during a blizzard.