why i cannot play the bakery

Welcome to Soda Community @skippy29 @mahS2

Bake a Cake is a feature in Soda that's not available for all players at all times. Sometimes the bakery will be closed to make room for other features. 
When "Coming soon" is shown in the event, it means the feature is not currently available, this can be either due to it taking a break in your game or that your team has already finished baking the cake.

You can find more info here. Just make sure you have the latest game update. Current version is 1.268.5