It could be to participate in a library program or just to hang out and read.

可以是参加图书馆的活动或者就是随便逛逛读读。

youdao

At the CWAC, anyone is welcome to create their own sessions, offer free coaching to others, or just hang out!

在CWAC上，欢迎任何人创建自己的专题，给他人提供免费的指导，或仅仅与他人分享！

youdao

Many fashionable young people go there to shop, be seen, or just hang out.

许多时髦的年轻人都去那儿购物，招摇，或只是闲逛。

youdao

"I don't really do a whole lot. I normally just spend time with family, go out to eat,hang out, wait for the ball to drop on TV."

VOA: special.2009.12.28

San Diego is very quiet, mellow, just kind of go to the beach and hang out.

圣地亚哥很安静，很温和，就是去去海滩，散散步。

洛杉矶VS圣地亚哥 - SpeakingMax英语口语达人

But just go to cs50.net, click office hours and you'll see the Google Calendar with all of the office hours that are still happening tonight, as well as tomorrow and these are just an opportunity to chat, to ask questions one on one with the teaching fellows or course assistants or frankly just a way to hang out during brain break and work on projects and then see what some of your friends might be tackling themselves.

但是我要提醒大家去cs50，net网站看看,这里清清楚楚告诉你,什么时候该学习工作，当然也包括今晚的明天的，我们还有一个机会供，一个与研究生助教或课程辅导员交流的机会,更直白来说,是提供你们开小差的机会,看看你们周围哪些人,在开小差呢。

哈佛公开课 - 计算机科学课程节选

The other possibility (for example in the case of the swimming qualifiers) could be that ticket holders decided that it was more interesting just to hang out in the Olympic Park.

FORBES: The Olympic Ticket debacle

"I just want to hang out with my girlfriend and my mom, " he pleaded.

BBC: Kerrang! awards

Young guys don't have to just hang out in the streets, they can practice instead.

WSJ: Runners Find Stairways to Heaven Amid Asia's Skyscraper Boom