  In this paper we introduce two world-first Mixed Reality (MR) experiences
that fuse smart AR glasses and live theatre and take place in a heritage site
with the purpose to reveal the site's hidden and difficult histories about
slavery. We term these unique general audience experiences Mixed Reality
Heritage Performances (MRHP). Along with the development of our initial two
performances we designed and developed a tool and guidelines that can help
heritage organisations with their decolonising process by critically engaging
the public with under-represented voices and viewpoints of troubled European
and colonial narratives. The evaluations showed the embodied and affective
potential of MRHP to attract and educate heritage audiences visitors. Insights
of the design process are being formulated into an extensive design toolkit
that aims to support experience design, theatre and heritage professionals to
collaboratively carry out similar projects.
