This is the 5506th most frequent Japanese word.
おこなわ
"おこなわ" is not a standard Japanese word. You may have meant "おこなう," which means "to perform" or "to carry out."
Here, 'おこなわれる' is used to mean 'to be conducted,' indicating the passive form of the verb 'おこなう' (to carry out).
儀式が神殿でおこなわれました。
The ceremony was conducted at the temple.
In this example, 'おこなう' is used in its active form, directly referring to the action of performing or carrying out the plan.
彼は約束を守るために計画をおこないました。
He carried out the plan to keep his promise.
The passive form 'おこなわれる' is used here to indicate that the action of holding the lecture is going to occur.