Two things happened to me yesterday; one minor, the other major.
The first incident was an exchange with a stranger. Without knowing it, I had stepped over this person's boundaries. They let me know (politely) and that was that. I didn't see it coming and felt slightly embarrassed. My Moon is in etiquette obsessed Libra....I should have known better! However, everyone's boundaries are different so sometimes you just never know.
The second event involved a close friend. We have known each other for 20 years and are like family. I found out that she was ill. It's fairly serious but we won't know how much so until later. Again, I didn't see that coming. This time it was a painful shock and my first thought was "I can't lose her". She's not dying but this was the first place my mind jumped to. My Mercury is conjunct Pluto, the planet of death.
Two different events involving two different people but both triggered, I believe, by transiting Venus (relating to people) square my natal Saturn (limits). Venus is moving through Aquarius (friends and people in general). So I encountered limits in a friendly conversation and the fear (Saturn) of losing a close friend.
Not one of my better days but a good illustration of how transits can trigger multiple events.