See into the future.

Recently, when I create a newsletter email for a workshop or specific event, I also created another with the "last day to register" or "only a few spots left for tomorrow's event" email. 

I send the original one out about 2-3 weeks prior to the event (depending on the type) and then the reminder set to automatically go the day prior to the event. This way, we have a better chance at filling all the spots. I set the reminder email to automatically leave out anyone who has already registered ... in case I decide to offer a promo to get more people in last minute. Then, I set a reminder on my calendar to look at the email the day prior to see if I need to edit the number of spots, or add a promo.

I had one of these situations go out for a workshop tonight with 5 spots left. They were all sold within an hour. I am certain that this would not have happened without this extra email. 
I typically make the second reminder email short and sweet and no graphics.

Another thing I've done recently to help streamline work:
When I create a graphic (in Canva) for a workshop or event, I duplicated it and create another with "2 spots left" or "half full" or "almost sold out" layered across the the front of the graphic. This way, when we get to that point, the graphic is made and ready to post and create urgency to purchase. I also make a duplicate of the original graphic with a big SOLD OUT or FULL overlaid. This is really really fun one to post and and start a waitlist. It reminds people to act fast for the next one.

Love to hear any other procedures you have to streamline work.