das Konzert
concert
A public musical performance in which musicians, a band, or an orchestra play or sing in front of an audience.
Wir gehen am Samstag auf ein Konzert unserer Lieblingsband.
We're going to a concert by our favorite band on Saturday.

concert
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concert
A public musical performance in which musicians, a band, or an orchestra play or sing in front of an audience.
Wir gehen am Samstag auf ein Konzert unserer Lieblingsband.
We're going to a concert by our favorite band on Saturday.

The two meanings of 'Konzert' (concert/concerto) are easy to distinguish. If a band, singer, venue, or audience is mentioned, it means the performance (m01). If a composer or instrument is mentioned, it means the composition (m02).
Ich gehe heute Abend auf ein Rock-Konzert.
I'm going to a rock concert tonight.
As a visitor, you can say 'auf ein Konzert gehen' (to go to a concert) or 'ein Konzert besuchen' (to attend a concert). Musicians, on the other hand, 'geben ein Konzert' (give a concert) or 'spielen ein Konzert' (play a concert).
Nächstes Jahr gibt meine Lieblingsband ein Konzert in Berlin.
Next year my favorite band is giving a concert in Berlin.
To express movement to a concert, German uses 'auf' or 'in' with the accusative. To describe being at the concert, the same prepositions are used with the dative.
Wir fahren morgen auf das Konzert nach Hamburg.
We're driving to the concert in Hamburg tomorrow.
In the meaning of 'composition', 'Konzert' (concerto) is often used as the base word in compounds that name the solo instrument. Examples are 'das Klavierkonzert' (piano concerto), 'das Violinkonzert' (violin concerto), or 'das Cellokonzert' (cello concerto).
Das Orchester spielte Beethovens fünftes Klavierkonzert.
The orchestra played Beethoven's fifth piano concerto.
show
'die Show' and 'das Konzert' can both be public entertainment events. 'das Konzert' is always a musical performance: musicians, a band, or an orchestra play or sing in front of an audience. 'die Show' is broader. It can include music, but also dance, comedy, hosting, lighting effects, or a television program. The words can be confused because many concerts today also feel like big shows. When the music is the main focus, 'Konzert' is more precise. When the overall entertainment and staging are important, 'Show' fits better.

Am Freitag gehe ich mit meiner Schwester zu einem Konzert der Band.
On Friday, I am going to a concert by the band with my sister.
Die Show hatte laute Musik, Tänzer und viele Lichteffekte.
The show had loud music, dancers, and lots of lighting effects.