Opera Day
Opera Day is held on February 8. This event in the first decade of the month February is annual. 
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This unofficial holiday arose as a social initiative through social media and has been actively supported since 2018.
Hashtag - #OperaDay
Similar holidays and events, festivals and interesting facts
Ice Music Festival in Finse, Norway on February 7 (They claim to be “the coolest outdoor experience” — and they’re probably right);
Musikahan Festival on February 21 (Tagum City, the Philippines);
Dancer Day in Argentina on February 28
National Music in Our Schools Month in USA on March 1
CD Day on March 2
International DJ Day on March 9
World Piano Day on March 29 (a annual worldwide event founded by a group of likeminded people, takes place on the 88th day of the year – because of the number of keys on the instrument being celebrated)