Currently, you are unable to load extra fonts into Event Temple to use. We have several default fonts to choose from.
In Document Templates you can copy and paste the formatted text into the Text Elements to match the font you desire. However, other Document Elements, that pull in information from the Booking, such as Menu Items/Events and Spaces and Room Blocks are limited to the predetermined fonts.
For Email Templates, although they have the same font options. You can copy and paste the text formatted to your desired font into a template. You can then add Merge Fields into the template using the same font.