This is the 6448th most frequent Polish word.
chełmnie
"Chełmnie" does not have a direct meaning in Polish; it seems like either a misspelling or a derivative of "Chełmno," a place name in Poland.
Here, 'Chełmnie' is the locative case of 'Chełmno', denoting the location where the event occurs.
W moim rodzimym mieście, Chełmnie, odbywa się coroczne święto lawendy.
In my native town, Chełmno, an annual lavender festival takes place.
In this sentence, 'Chełmnie' is used to indicate the place where the subject was during a specific event.
Byłam w Chełmnie, kiedy zaczęło padać.
I was in Chełmno when it started raining.
The use of 'Chełmnie' here again illustrates the locative case to specify the place of the meeting.