
die Messe
fair / trade show
A large event where companies present and sell their products and services; a trade or public exhibition.
Nächste Woche fahre ich zur Buchmesse nach Frankfurt.
Next week I'm going to the book fair in Frankfurt.
fair / mass
Loading your saved state.

fair / trade show
A large event where companies present and sell their products and services; a trade or public exhibition.
Nächste Woche fahre ich zur Buchmesse nach Frankfurt.
Next week I'm going to the book fair in Frankfurt.

Mass
The most important church service in the Catholic Church.
Am Sonntag gehen meine Großeltern immer in die Messe.
On Sundays my grandparents always go to Mass.

Mass
A musical composition that sets the fixed parts of the Catholic church service (the Ordinary) to music.
Mozarts Große Messe in c-Moll ist ein Meisterwerk der Kirchenmusik.
Mozart's Great Mass in C minor is a masterpiece of church music.
You can recognize the meaning of 'Messe' (fair/Mass) from context. If it is about business, products, and halls, an exhibition (m01) is meant. If it is about church, Sunday, or a church service, the religious celebration (m02) is meant.
Auf der Automesse werden die neuesten Modelle vorgestellt.
The newest models are presented at the auto show.
When it refers to an exhibition, the prepositions 'auf' and 'zu' are used. You are 'auf der Messe' (at the fair) and you go 'zur Messe' (to the fair).
Ich habe auf der Messe viele interessante Leute getroffen.
I met many interesting people at the fair.
In connection with exhibitions, 'Messe' (fair/trade show) is often used in compounds to specify the type. Common verbs are 'besuchen' (to visit/attend) or 'ausstellen' (to exhibit).
Viele Verlage stellen auf der Buchmesse ihre Neuheiten aus.
Many publishers exhibit their new releases at the book fair.
When the Catholic church service is meant, the preposition 'in' is used. You go 'in die Messe' (to Mass) and you sit 'in der Messe' (in Mass).
Der Priester lädt die Gemeinde ein, die Messe mitzufeiern.
The priest invites the congregation to celebrate Mass together.
When a musical composition is being discussed, 'Messe' (Mass) often appears together with the name of a composer or musical terms such as 'Chor' (choir) and 'Orchester' (orchestra).
Der Chor probt für die Aufführung von Bachs h-Moll-Messe.
The choir is rehearsing for the performance of Bach's Mass in B minor.
market
At a market, the focus is usually on vendors selling directly to customers. A trade fair is a larger organized event where companies mainly present their products and services and seek business contacts, even though things may also be sold there.

Auf der Lebensmittelmesse stellt der Betrieb seinen Käse neuen Geschäftspartnern vor.
At the food trade fair, the business presents its cheese to new business partners.
Auf dem Wochenmarkt verkauft der Betrieb seinen Käse direkt an Kunden.
At the weekly market, the business sells its cheese directly to customers.