And more local music news...by D.X. Ferris...Mushroomhead will celebrate their 16th annual Halloween show with their first live DVD shoot. On Saturday, October 31, Cleveland's masked metal kings will stage their most elaborate Halloween concert to date, incorporating props from previous years, at the Agora Theater (5000 Euclid Ave.). "Take the last five Halloween shows, and throw 'em all together — plus some extras," says drummer/band leader Steve "Skinny" Felton. A crew will shoot with five professional cameras, two of them high-definition. The band will play…