2 main places... @abh12345 has a curation and engagement league... It is the place to meet the future power players... Here is the link:

https://steemit.com/steemit/@abh12345/steemit-the-curation-leagues-sponsored-by-carlgnash-and-paulag-steem-and-possibly-delegation-prizes

and the other one is Steemit Comment Challenge run by @danielsaori. That is a weekly contest where 100s of people show up to make comments on his reference post of the week... Lots of people show up just to meet the others. Here is the link:

https://steemit.com/steemitcommentchallenge/@danielsaori/steemit-comment-challenge-21-usd5-sbd-2-x-200-sp-1-weeks-delegation-comment-like-a-champ-grow-your-blog-like-a-champ