GOOGLE CALENDAR has built in CALENDAR GRAPHICS that appear when you use specific words in the event title.
Since Google Calendar hasn't put out a list of all of the Calendar Graphics available, you can experiment with words to see if there is a graphic to go with them. For example, if you use the word "movie", there is no graphic, but if you use the word "cinema", you will see a graphic. Not all of the holidays have graphics - yet. Google is always updating so we could see some graphics added as time goes on. The advantage of using the Google Calendar app on your phone is being able to add the emojis. The other advantage is if you're in the Schedule view when using the app on your phone, you will easily see your graphics without having to click on the event.
