My 21st birthday

I'm trying to plan a trip for my 21st starting on the 30th of May and ending as shortly as possible. it’s going to be me and my bf leaving from Huntingdon in the uk. we want to go to the rock am ring festival in Nurburgring, Germany from the 4th of June to the 7th, we would like to go see jimmy Morrison’s grave in Paris, I want to go to the mid summer solstice celebrations in Avebury stone circles and would like to be there from the 18th to the 21st or 22nd, my birth day is on the 23rd and I would like not to be flying then and then finally we want to go to Australia for a week or too so I can see my family and have a 21st/ engagement party.

The idea is to see as many places for as little money as possible would love to see as many places in Europe as possible

I welcome all suggestions and advice, feel free to help