Would it be possible to have a custom page template with Esplanade?
I would need to have a custom header (this can be done with a plugin),
but would it be possible not to display the site name and description on this specific page?
Would it also be possible not to show the sidebar, or just show certain widgets on sidebar on this specific page?
You can use the full width template that is already built-in. As for hiding the text in the header you have that option under Appearance > Header but that setting would be globally.
For any additional changes you need to create a separate template.
Thank you for this usefull info.