"attended lectures" is correct and usable in written English.
For example, you could use it in a sentence like this: "He attended lectures on American history twice a week."
Respondents also attended lectures to discover what material lecturers subtly emphasized while lecturing.
They attended lectures, watched videos, participated in workshops.
I attended lectures on the history of cardiac surgery.
We attended lectures on emotional eating, nutrition, fitness, health management and meal planning.
Instead, he went to Paris, where he practiced painting and attended lectures at the Sorbonne.
According to Porphyry, Origen attended lectures given by Ammonius Saccas, the founder of Neoplatonism.
He attended lectures by Marcello Virgilio Adriani, who chaired the Studio Fiorentino.
While there, Hardenberg attended lectures on archaeology, history, literature, mathematics, the natural sciences, and economics.
Wearing business attire, they attended lectures: Etiquette, Ice Breakers, the 7 Habits of Highly Effective Teens.
While there Coleridge attended lectures on physiology and biblical criticism at Göttingen.
She also attended lectures at Amherst College and the Rensselaer School (now Polytechnic Institute).
