This is the 5726th most frequent Russian word.
проведены
"Conducted" or "carried out."
Here, "проведены" refers to the completion of the action of conducting (negotiations), implying they took place and were completed.
На прошлой неделе были проведены важные переговоры.
Important negotiations were conducted last week.
In this sentence, "проведены" directly relates to spending time, in a past passive participle form indicating the subject underwent the activity of spending time.
В парке мною были проведены целые выходные.
I spent entire weekends in the park.
The term "проведены" refers to the performance or execution of reconstruction works, highlighting that they were successfully completed.