RossMitchell

It would be really help us help you if you provided a link to the webpage in question.

My guess is that the calendar is drawn using javascript, maybe there is a scale setting.

Look at this: https://codex.wordpress.org/Hardening_WordPress

See if any of the security plugins can help, say:
wordfence
all in one wordpress security

Your web hosting may offer “Leech protection”

This would need to be done in javascript.
Modify the form created by “contact form 7” so that its send button invokes a javascript function, it displays the popup “Really Send” and “cancel” buttons, the onclick functions on these removes the popup and performs the action.
Lots of online javascript tutorials and info.

Yes you could do as Steve advises, OR you could use your browser inspector to identify the css creating your wasted space and adjusting it using the customiser > additional css.

Yes the fields can be dynamically populated etc.

You need to write a plugin that registers several shortcodes that do various database functions. These shortcodes go into different pages.
Say you have shortcodes called:
– searchanddisplay
– editentry
– addentry
– databaseadd

You create your custom database tables using phpmyadmin etc, at this stage dont bother with creating the tables in code.

This is what each of these shortcode functions would do:
– searchanddisplay
It has a search fields FORM and a results display table. The FORM has a “Search” button that does a submit to the same URL of this page. There could also be pagination controls, the pagination controls are distinct SUBMIT codes.
On entry it test if the search fields are set, if not it sets the search to default like ALL or whatever. It renders the HTML for the form, setting the fields to the received values (or default). It then does an SQL queary, possibly with pagination. If there are no results it says so. Otherwise it generates a table with one result per row, each row has columns for the various fields and a column with an “EDIT” button which is a LINK to the page with the “editentry” shortcode, it also has the key for that row.

– editentry
Tests that the row key is set, complains otherwise.
Tests if it is being invoked by itself using its own submit buttons, does the distinct operations some of which result in a page redirect, otherwise it does an SQL query on that row, displays the results in a form, there are submit action buttons for savechanges, back/cancel and delete.

– addentry
Displays a form, has submit buttons for ADD and cancel.
The ADD action directs to databaseadd page. The cancel links to the searchdisplay page.

– databaseadd
Validates the fields and reports errors, otherwise does an SQL database insert, reports on errors such as duplicate keys.

Note that other organizations are possible.
You can use javascript to provide various support and convenience features (such as “clear search fields”)
When I was getting started I found this plugin to be very handy:
https://wordpress.org/plugins/wp-csv-to-database/

What is in your .htaccess file ?
By its nature the web server does not need to activate WordPress when it is asked for an existing file, fancy security rules in .htaccess can change this.

how would i change that in Myphp admin?

It very much depends upon just what and where the errors are.
Most likely the changes would be made using the WordPress dashboard, it is only in rescue situations that they are made from wp-config.php or by hacking the database.

It is at the point of loading images + css etc (and other page resources), that the true mechanism behind the web surfaces. The URL in the browser’s address bar fetches the web page ONLY, the browser then has to request every css file, every image and icon etc from the internet as a stand alone action, there is no state, there is no context of prior requests.

So in short at this stage, just tell us what the different URLs are and we will see what needs to be done.

What do the logs show on your webserver ? Can you see the image requests ?

Use a browser inspector on some of the computers on the LAN, look at the html from your website, what URL are being used for the images ? How does it compare with your site address and WordPress address ?