This appears to be an event title rather than a performer identity. The structure 'Joy of Astonishment - An Afternoon of Magic' follows the pattern of how theatrical productions or show titles are named, not how individual performers, bands, or performance groups typically identify themselves. Likely this is a show/production title that was mistakenly recorded as a performer name at the California Theatre of Santa Rosa.
Listings for Joy of Astonishment - An Afternoon of Magic are compiled from public sources, each named with the site it came from and dated with the last time we read it. Details can change — confirm with the venue before you go. How we collect & verify.