Coming weekend the European Brass Band Championships are being held in Montreux (CH). This event is live streamed and the performances available for viewing the week after.

Link to live stream:
https://www.worldofbrass.tv/

You can hear / see some of the best euphonium playing in the world during this event.
Costs for viewing are 12.95 GBP (approx 17 USD)

Definitely worth the money in my opinion.