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Buenos días
Used the same way Good morning is used in English - to greet someone any time before noon.
Buenas tardes
Generally used between noon and 6 PM. The Spanish equivalent to Good afternoon.
Buenas noches
Literally translates to Good night, but can be used as both a greeting and as a farewell in Spanish.
Since you are greeting someone at 8 PM, you would say buenas noches.
Buenas noches
How would your greet a friend at the football game around 8 PM Friday night?
Answer: It depends on whether it is winter or summer, because in winter it is already dark at this time and the correct greeting would be "buenas noches", but in summer at 8 p.m. it is still day and the right greeting would be "buenas tardes".
Hope this helps!
[tex]\textit{\textbf{Spymore}}[/tex]