In Event Registration text boxes (both Enrollment Management, and Core/School Website), there is a 255 character limit. 

To save time, you can create your text box message in a Word document to keep track how many characters have been used. At the bottom left of the Word document, you will see a word count. When you click on the word count after you have typed your message, a popup will display and will advise on the number of characters used. Once you have your message completed, copy and paste it in your event registration text box.