Ghost User
2018-12-18T15:56:21+01:00

Event price can change after registration start

### Current behaviour / Reproducing the bug

1. I register for an event accepting the costs etc
2. The costs change
3. I pay more than what I accepted
4. I'm angry :angry:
5. Problems

### Expected behaviour

Event prices cannot change after registration start!

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This is also important for #632, since payments are made using the price in the event and if the price changes the payments cannot reflect that.