Help approaching bonds differently

I'm going to run an open-attendance 'campaign' on G+, similar to what I've seen people do with OSR games:  a 'job of the week' kind of freebooter campaign where every week whatever players are interested/available can join in and see what jobs their character can take on.  

The hitch is this:  Players may return or may not, so how do I handle bonds when there may be some returning characters, some characters that are gone for a while, then return, etc.  

I suppose everyone could just have an archive of bonds, some will just be with players who are 'off camera.'  It would be like real life-I have bonds with most of my coworkers, even though I'm not always doing a project with them all.  Some bonds are used in some projects, some in others.  

I was also going to offer players a list of 'tavern bonds' since this campaign will center around a tavern.  Things like "_____ stole money from the barkeep and I can prove it," or "the rumor is that ________ is good to have on your side in a fight," and "_________ once blurted out a painful secret of mine when he was drunk."  

Any other thoughts/clever ideas?  

Yes: use (or take inspiration from) the Planarch Codex!

Sorry, I didn't mention that, even though it's a HUGE inspiration for all of this.  I'm using a lot of the P.Codex, just with a more traditional setting. 

Bonds wipe at the end of the session.  Always write bonds anew with the characters present at the beginning of each session.  Any continuity is on the players to maintain.