This could be put on the home page to advertise upcoming events or classes, and to direct people towards getting in touch with you to book on. Unfortunately, I think any options allowing them to book on themselves would require premium WordPress:
hours minutes seconds
One-day workshops start again!
Check the Art Classes & Events page for more details and to book your spot!
This message could be set to appear only to people who have visited certain pages on your website more than once. It could prompt people looking at your artwork or your classes to get in touch by directing them to the contact page:
Possible replacement for the contact form on the Contact Me page: