日本語 Japanese Ask Questions Thread 8

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英語でも日本語でもOK
日本の方からのご協力も大歓迎です

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Can somebody please explain me which meaning に has in 晩餐会の食材を調達に？ part. My guesses -  晩餐会の食材を調達に_行った_？ or に here has the meaning close to ために, in other words shows the reason. So, my translation:
"Are you coming back after shopping? To supply the food for banquet?"

「買い出しの帰りだったんですか？晩餐会の食材を調達に？」
馬車の座席から荷台をのぞきこんで、ヒューイは軽く驚いたように言った。