Yes, there is a standing Aruba bulletin board party every Monday at 5pm at Amsterdam Manor's beach bar. Sometimes alot of people show up and sometimes it might just be a couple of people. It's more of a meet and greet - have a few drinks, meet a few people, talk about Aruba, etc. (very casual).
Drinks are 2 for 1 from 5pm-6pm.
It's about a 10 minute taxi or bus ride from downtown.
Amsterdam Manor's Beach Bar: