Recently, I found about a site called https://39chan.moe/
It is an imageboard dedicated to Vocaloid and related topics, similar to /miku/. They've been partly inspired on our board, back when we were in 8ch. It has its own history, but its current incarnation is very recent.

I contacted the staff the other day and I've been made part of their moderation team. Nothing here will change; /miku/ is still its own thing and we'll keep the attic going no matter what.
That said, I invite you to check out the site. They have a variety of boards and a radio. They are open to suggestions, including things such as the events and MMs that we used to do.