Thanks Bhai. Here are the answers to your question.
1 - No need to register any where but feel free to comment to the post
https://peakd.com/hive-140217/@ecoinstant/dcity-final-claimdrop-70000-hive-up-for-grabs-right-now
2 - In the post they mention - 6/26/26 the day to look forward to.
Also refer this link for people sending #SIM to @null
https://he.dtools.dev/@null?symbol=SIM
cheers