How come "a" is put before "second" in this sentence?
The indefinite article "a" is put before "second" here because "second" is describing the singular noun "Bar mitzvah". Since Bar mitzvah is a singular noun, it must be referred to with an indefinite article "a" before it, however the indefinite article must be placed before the adjective describing the noun. Ex: We are going to have a big party on Saturday. Ex: Do you want a little bit of soup or a lot? Ex: She wore a fancy white dress.