I dunno about the extras, but some of the film's stars are still riding its wave. This summer, a screening tour that commenced with the 40th anniversary in 2013 continues with dates in Massachusetts, Connecticut, and Rhode Island (so far).
Each evening includes a screening of a new digital print of JCS optimized for listening and viewing pleasure, a Q&A and/or costume contest (I've heard about both on different stops of this tour; in the event of a costume contest, one can show up dressed in generic hippie garb or specifically as one of the film's characters, and they get cool swag for the best costume), a sing-along during the screening, and a meet and greet with the original cast (where pictures can be taken and items will be signed) after the show.
For dates, check out "2018" under Special Events in the U.S. section of this page.
Formerly gvendo2005
Broadway Legend
joined: 5/1/05
Blocked: After Eight, suestorm, david_fick, emlodik, lovebwy, Dave28282, joevitus, BorisTomashevsky, Seb28