"In preparation for" or "In Preparation of"? [closed]

What´s the difference in use between "in preparation of" or "in preparation for"? They seem both correct.

Context:

The team practiced how they would respond to bad weather in preparation of Election Day.


It depends entirely on context, and is dictated by the meanings of the separate prepositions 'of' and 'for':

'I am making plans in preparation for my daughter's wedding' but; 'I haven't made the cake yet, I am still involved with preparation of the ingredients'.