Photography

Easiest way to get something looking decent is https://pixieset.com/

https://dale41.pixieset.com/birthdaygirlbeyourownpet/ is an example of a show I did a few days ago.

Dont send 50 photos, unless its greatest ever looking show you would be looking between 5 and 10 per band. You arent going to mess anything up, you dont have a contract and nobody is expecting anything from you and probably wont use the photos. But some of them may love them, use them and help you out / promote you so yeh definitely send them along if you are willing to.

Have fun! (and make sure to keep your ss fast enough 1/250 min, worry less about ISO than you will do)

Who are you shooting for? The band, a publication, a wire service, something else?

How do you normally get photos to clients?

Edit: oops, I missed that you already said this in the post.

Cold e-mailing still works? At what percentage? 1%?

Each and every mail I receive like that ends up in my spam folder, so I assume others will often do the same. Perhaps it's better to try and set up some connections out of those few gigs you'll get and hopefully you won't have to spam e-mails around anymore. It's very frustrating and very often you won't even get a response at all.

Just use any cloud service or WeTransfer to send the photos.