Just what it says on the tin. The 20th Anniversary Concert for cult PS1 hit Xenogears will be getting a live stream on NicoNico that fans unable to attend can pay to watch for about 2500 yen.

Those who get to attend the event and pay a special fee will also receive a music box. The concert is being produced by Yasunori Mitsuda and
will be performed by the Ahnenerbe Orchestra –Xenogears Concert Special Band & Orchestra-, with special guests Joanne Hogg and ANÚNA. The stream will take place on the concerts final performance on April 8th. The link to the new article has a link to where you can buy tickets.

Source: Siliconera