This is the 11712th most frequent Russian word.
завершатся
"Завершаться" means "to come to an end" or "to be completed."
In this sentence, 'завершатся' is used to indicate the completion of an action (the construction work) by a specified time in the future, which is a typical future tense usage in Russian.
Все строительные работы завершатся к концу июля.
All construction works will be completed by the end of July.
Here, 'завершатся' conveys the conditional future completion of an activity (the shooting) contingent on a preceding condition being met.
Если все пойдет по плану, съемки завершатся через неделю.
If everything goes according to plan, the shooting will be completed in a week.
In this example, 'завершится' (a singular form of 'завершатся') illustrates the future completion of a singular subject (the project) depending on certain conditions being fulfilled.