Learn Turkish: Davetiyeler için nerelere uğramak lazımdı? - Where all was it necessary to stop by for the invitations?

Adding the plural suffix -ler to a question word means the speaker expects a multiple-item answer. While nereye just asks "where," nerelere asks "what are all the places." The English translation "where all" perfectly captures this expectation of a list of destinations.

Why does the question word end with the dative suffix -e (nereler-e)?

The verb uğramak (to stop by / drop by) requires the destination to be in the dative case, showing motion toward the place. So the word breaks down as nere (where) + -ler (plural) + -e (dative "to").

How does lazımdı work here? I am more used to just seeing lazım.

Lazım functions as an adjective meaning "necessary." To talk about a past necessity ("it was necessary"), you simply attach the past tense copula -dı directly to it. The phrase uğramak lazımdı means "it was necessary to stop by" or "we needed to stop by."

Could I use davetler instead of davetiyeler in this sentence?