You can publish whatever you want in the Offcanvas Section. It can be any module or particle.
By default, the available module positions are offcanvas-a and offcanvas-b but you can add as many module positions as you want from the Layout Manager.
You can also add the hidden-phone module class suffix to your modules so they do not appear in the Offcanvas Section when the site is loaded on a mobile device.
I'll Be at the Northampton County Cultural and Wellness Center on the 4th of July, at the "Northampton County 4th of July Celebration 5:00 PM until 9:00 PM"