Before registration opens: Announce "registration will open"

[wolframkriesing]

• [ ] schedule daily tweets @wolframkriesing
• [ ] contact the sponsors that registration opens (email by those who are in contact with them)
• [ ] tweet each sponsor linked with "open registration" @wolframkriesing
• [ ] contact the partner conferences
• [ ] linkedin post about upcoming registration opening
• [ ] meetup "jscraftcamp" post @wolframkriesing
• [x] email softwerkskammer @marcoemrich
• [x] announce in codecentric @marcoemrich