So I am sure someone else has a better solution but I thought I'd share a story. One of my few peeves I have with my echo device is that it doesn't announce to me when I have an event about to happen unless it's a reminder. So what I've done is used IFTTT web hooks and RMs HTTP trigger to have IFTTT send a call to RM which then use TTS to Make Alexa say, "You have an upcoming event. You can ask for details by saying Alexa, what are my upcoming events?". This way at least I know something is coming up.
Here is a thread to the app I am using to send TTS to my echos.