I think people worry too much about branch names. Feature branches are usually ephemeral. Prefix your branch with your personal identifier so I know who is primary on it and worry more about the commit message which will live on indefinitely.
The argument I've always heard for this was issues with code, not the event. If for a period of time you have a bug in your code, with event sourcing, you can fix the bug and replay all the events to correct current projections of state.