stare at the calendar the whole time through.
The trick is to NOT think about the concert any more than you need to. Look at closer events. Christmas, and what you have to do for people. Birthdays. Other holidays. School tests, parties, etc. By concentrating on shorter periods of time, the 8 months will go by a bit quicker.
You need to get out and increase your awareness in many more things other than a concert. Do your best at not being so shallow. When you have many interests to be involved with a simple concert in the future months will seem only minutes away.
Get in a spaceship that can travel, say, half the speed of light.
Time will go by faster for you than those back on Earth.
I dont know the exact numbers, but an astrophysicist should be able to tell you.
1. Get a calender
2.go ahead 8 months on the calender
3.mark a mark 8 months ahead on calender
there ya go
just go sleep like coma
Im gonna go to a concert and its in 8 months how can i make time go by faster?