Ron was there, obviously. And because he's so imaginative in his gifts he brought along a huge bag of sweets. (His other option was alcohol, but he didn't think Remus or Tonks would have been pleased by that.)
Gilderoy was there as well - he knows Teddy, and Remus is important to him. His present was a cool book because yes, there are books that are cool.
Greg and Rolf didn't show up, the first because he didn't think he'd be welcome (that seems to be his usual reasoning nowadays), and the latter because he's still jn reclusive mode.