A shortcode is manually set to build all the related urls, ie 'the-moon-2020'. This is because the name of the event and the URL may not be the same and it needs to be referenced when constructing views and sub-pages.
Add the class 'checklist' to any <ul> element to get green ticks by your unordered list.
The sub menu will automatically include links to home, register, sponsorship page and venue details as those sections are filled in.
Attribution links are included for the header image as good practice, ideally in an html format linking back to the original work/photographer, but a plain text name is fine too!
Further links can be added in the menu section (ideally don't add too many and keep link names short).
If you want to add the site-wide standard green buttons to link to pages, add the class 'greenbutton' to any <a href> to get the green button. Include 'small' with 'greenbutton' to get a half-height button, ie 'class="small greenbutton">.
So firstly create the placeholder level which is the name of the event, eg 'The Moon (placeholder)'.
Then create each sponsor level as a taxonomy, setting price, discount, etc. The key attribute to decide for each is if the logo will display as full, mediumsmall or text — what you set here will define the size/format the logo appears later. Make sure you set the event name as the parent taxonomy.
If you've also filled in the sponsor details in the event node above, you should now get a page at civicrm.org/civicamp/the-moon-2020/sponsorship with header / footer / sponsor link and the sponsor levels.
These can be created at https://civicrm.org/node/add/sponsor - and the name, logo and link and sponsor level (for the right event) is added. It's worth checking first if the sponsor has sponsored a previous event as you can then just edit their existing record and add the sponsor level for the new event.
NB: A logo is needed, even if they are sponsoring at a level which doesn't display a logo.
Related event detail pages
These can be created at https://civicrm.org/node/add/event-detail-page – and are for extra pages not included above. They are a standard page node with an added select field to chose the related event. When published the page will include the appropriate event menu and the sponsor block footer - and will generate the correct URL.
Other event pages
If you create other node types - ie a webform for collecting session proposals - you can convert the display into a panel and then add a view for the event submenu and sponsor block at the top and bottom. The submenu and sponsor block pane will filter to the correct details based on the URL. Because of this they can't, currently, be included on CiviCRM contribution/event pages because of how paths are handled.