The existing website is www.flohmarkt-zug.ch
It is in German and English, the default language is German. The existing website is built on Odoo 12.
The new website has a temporary URL as https://flohmarkt-zug.twanda-hosting.ch
It is built on Odoo 14 (Docker).
Both are dedicated databases, no multi-company. Admin user has the same credentials for both databases (see skype Siddharth for the password).

The existing website has to be copied to Odoo14 in both languages by building a new Website using the features and functionalities of the new Website Builder, do not copy QWeb Views! It should look similar, but it must not be pixel-equal, it should take advantage of the new Website Builder building blocks and possibilities.

The original website was built with theme "Real Estate" and color preset 1 (see https://apps.odoo.com/apps/themes/14.0/theme_real_estate/ )

Please set the proper general theme options for the color scheme and fonts and headings etc.

Looking at Odoo 14 EE (Lenzerheide Motorclassic from Digital Advisory Group) I see in the backend for each ticket/attendee if the ticket is already paid or not. If I remember it correctly, there is also a ribbon on the upper right side of the ticket badge showing the status.
I don't know if this is a Enterprise feature only or if it is the same in the CE 14.0. If it is not a community feature, we need urgently the same in Odoo 14.0 CE. In addition, it would be very helpful, if we could also print this ribbon on the ticket badge.

Our event tickets are (obviously) related to corresponding products. Mainly we have 4 different products. The first and most important product is the place (or pitch), we have 2 different kinds of places, one kind is a place of 3x3 meter, which is more expensive than the other kind, a place of 3 m in length (available in the streets of the old town). As you have migrated the website to Odoo 14, you should know what I'm talking about :-) Additionally to such a place people can optionally order an accessory product, which is either a booth or a table set. Booths and table sets can only be booked, if there is already booked a corresponding place to put the booth or the table set on. Very often people are booking a booth or a table set only, without a corresponding place, because they don't understand and do not read the text :-)
This leads to a lot of questions, communications and therefore a lot of unnecessary work. It is also the reason why we can not automatically confirm such a booking/reservation, which makes me crazy every event.
If a product is defined as an accessory product only, then it should not be possible to book the corresponding ticket only without having booked to corresponding base ticket and a corresponding, customizable and translateable error message should be shown and the reservation page should stay open for the visitor to book the missing ticket.
I hope you understand the issue and your ideas are very welcome.

When booking an event ticket on the website, show the image of the related product for the corresponding ticket on the event booking page (like on the shop page).

Please show a scannable bar or QR code on the ticket badge which allows to check the invoice with mobile device and to see the state and details in the case when discussions arise about what was ordered and what was paid when or not.
For your information:
At our flea market it is also possible to come and set up a place without preordering using our website. it costs an extra price, but this is an additional and appreciated service.
In order to collect the outstanding fees and control the preordered tickets and payments, 2 people of our team visit every place and check the preordered tickets and encash outstanding amounts if any. In the future, we will also use the Odoo POS system to encash not preordered services.