Missing talks

[davidlange6]

• https://indico.cern.ch/event/1380163/contributions/5988020/
• https://indico.cern.ch/event/1338689/contributions/6015944/
• https://indico.cern.ch/event/1338689/contributions/6010700/
• https://indico.cern.ch/event/1459124/contributions/6155024/
• Last years NSF pi meeting poster
• Euro LLVM
• The tutorials should also appear as presentations with a link to the event page - we already start to lose where they are given