Yes, you can link notes to the individual instances of a repeating event, you can however not link the same note to multiple instances of a repeating event, which is I think what you are asking for. My suggestion would be to consider two things:
if your weekly events always have a similar structure/agenda, consider using a template note that you can use when you create a new note for an event.
if you create a new note to an instance of repeating event, Agenda will automatically insert the link to the previous event in the series, which allows you to easily jump back to the previous note.
Together this should make it less needed to use the same note for multiple events, which goes against our philosophy of making sure you keep a paper trail of your past (i.e. be able to see the notes exactly as they were 3 weeks ago at the meeting), as opposed to keep an “live” note where you inevitably end up deleting things from 3 weeks ago as they are no longer relevant.