Simple way to link multiple pages within a site.

you can dynamically create your menus from a client mechanic by using Javascript.
you could set up a JSON file of type

[
	"menu1" : [
		"submenu1" : { "label":"Label for menu 1", "link":"pagelink.html" },
		"submenu2" : { "label":"Label for menu 2", "link":"pagetwolink.html" }
	],
	"menu2" : [
		"submenu1" : { "label":"Label for menu 1", "link":"pagelink.html" }
	]
]

and then you can set up the various menus in each page using DOM scripting... that way you will just have to add lines on the JSON object when adding pages

you point to the site thesocietyofbeatogiacomodibitetto.com . would this be the menu in the form of a black banner? if you tell us more (or confirm) about the type of menu, sub-menus you want to set up, we can generate a piece of code for you

How are you with PHP?

There's nothing built into DW that can do this for you, but you could use a relatively simple PHP script to list all of the pages in a given directory and add links to them, so any time you upload a page to a specific folder, the menu automatically sees and adds the file for your viewers.

Something along these lines could probably be modified to fit what you need: http://www.learningaboutelectronics.com/How-to-list-all-files-in-a-directory-using-PHP.php 

If the menus get too long, it may be better to link to a page that has a list of files, more like the link above, than to have a difficult to scroll (especially on mobile) huge pop-up list. 

In addition to what has been said about implementing a CMS to help with this, having super long or large menus may not provide the best UX to the end-user.  As your site grows, you may want to consider alternative ways to link to those pages or maybe interactive elements to make searching for a particular event or year of an event as opposed to larger menus.

Unless your site is dynamically-driven and tracked (i.e. using a server-side language or a base like WordPress, etc.), there is no way to have Dreamweaver (or any other IDE) automatically populate your menues/navigation with new page content...