講座 and 講演: A learning course and a lecture event
Compare a photography or writing course with a lecture about environmental issues and the question period afterward. Preserve registration and learnable content without adding course completion.
A registered course and what can be learned
講座 means a course. 「市民向けの写真講座に申し込んだ。」 says the speaker signed up for a photography course for local residents. Registration does not establish attendance or course completion.
「この講座では文章の組み立て方を基礎から学べる。」 describes a course where organizing a piece of writing can be learned from the basics. Available learning content does not establish that a learner has already mastered it.
A lecture topic and a later question period
講演 means a lecture delivered to an audience. 「大学で環境問題について講演した。」 states that a lecture was given at a university about environmental issues.
「講演の後に質問の時間が設けられた。」 says time for questions was provided after the lecture. Providing the time differs from stating that questions were actually asked.
A learning activity and an audience event
講座 emphasizes a course for learning specific content. 講演 emphasizes speaking to an audience about a topic. Read the course content and the sequence leading to the question period.
The examples do not establish that every course has several sessions or every lecture has exactly one. Do not impose a fixed division based on the institution, fees, or eligibility.
Which actions are stated in 申し込んだ for a photography 講座 and 講演した about environmental issues?
Show the answer and why
The first states registration for a course. The second states delivering a lecture. Registration is not the same as attending or completing the course; the lecture’s stated topic is environmental issues.