There is almost always a long line of pilgrims waiting for their one minute of time inside the edicule and the tomb.
July 15 is celebrated every year in Jerusalem as Dedication Day of the Basilica of the Holy Sepulchre.
Consecration of the new church (built over earlier destroyed ones) took place on July 15, 1149, the 50th anniversary of the Crusaders' conquest of Jerusalem.
Solemn Mass will be celebrated at 7:30 a.m. tomorrow by Fr. Pierbattista Pizzaballa, Custos of the Holy Land.
UPDATE: Here is the latest video: http://www.terrasanctablog.org/2015/07/17/the-feast-of-the-dedication-of-the-holy-sepulcher/
Here is a 3-minute video of the Mass from several years ago, also presided by the Custos:
(Linking to inSPIRED Sunday.)