You (and everyone else) have no right to enter any country outside your country of birth. If you don't live in your country of birth and are a citizen of that new country then you have no ride to enter any country outside your country of birth and your country of residence.

Also, think about it, if you are not in Europe, you could be spending $1000-$2000 on plane ticket, $300-$1000 on hotel for the weekend, food and the cost of any local attraction you do outside WordCamp like a museum, bar, etc...

All for a $40 ticket. If I wasn't involved in the WordPress Community and I was Immigration, I'd grant you the visa then as soon as you set food on my country, I'd have you sent to a hospital to have you examined.