This NIP is not yet in main.
Here is an overview of PRs referencing this NIP.
NIP-0b - On-Behalf of (Simple Sub-Key Management) OPEN @ice-orestes
format(all): JSON formatting MERGED @kehiy
Add 30515 OPEN @satoshisound
Revert "rename "parameterized replaceable event" to "addressable event"" OPEN @fernandolguevara
rename "parameterized replaceable event" to "addressable event" MERGED @fiatjaf
NIP 51: Adds Kind 10011 Profile Gallery CLOSED @believethehype
Local Relay list OPEN @vitorpamplona
NIP-46, NIP-51, NIP-90: "encrypted" tag to indicate the encryption method used OPEN @alexgleason
rename "parameterized replaceable event" to "tagged-replaceable event" CLOSED @fiatjaf
Kind mute sets MERGED @SnowCait
add kind 10033 private follows list CLOSED @haorendashu
wiki relay list CLOSED @pablof7z
NIP-51: temporarily remove video curation sets CLOSED @AsaiToshiya
Add audio track NIP OPEN @staab
File metadata sets MERGED @franzaps
Fix some minor nitpicks in NIP-15 and NIP-51 MERGED @AsaiToshiya
Adding ability to have expiring mutelist items OPEN @fishcharlie
Update 51.md to add support for video lists MERGED @zmeyer44
NIP-02, NIP-51: new tags should be added to the end of the list MERGED @alexgleason
NIP-XX Places OPEN @arkin0x
Remove all NIP authors MERGED @fiatjaf
Make NIP-51 useful again MERGED @fiatjaf
Add reviews NIP OPEN @staab
NIP-54: decentralized wikis MERGED @fiatjaf
add relay sets kind to nip-51 MERGED @fiatjaf
Nip 51 extended kind 30001 MERGED @gzuuus
merge nips 12, 16, 20 and 33 into nip 01 MERGED @fiatjaf
Specifies a hide keyword tag into Mute Lists CLOSED @vitorpamplona
NIP-29: Simple Groups MERGED @fiatjaf
Categorized Custom Emojis List CLOSED @SnowCait
New specification for NIP-51 to accept curated articles (edited from NIP-24 proposition for topics) CLOSED @mostafa-khaldi
Implement Markdownlint GitHub action OPEN @mariano-perez-rodriguez
Markdown improvements, embelishments, and standardizations CLOSED @mariano-perez-rodriguez
fix typos MERGED @mattn
fix grammar and typos MERGED @vivganes
Update all NIPs to include 'depends' and 'mentions' tags OPEN @blakejakopovic
NIP-51: remove self-referential links MERGED @jiftechnify
NIP-51 Lists MERGED @monlovesmango