I smile, if they look at me and keep going but don't say anything.  

I am friendly and outgoing and typically smile and say HI to people I walk past but purposely don't say anything to a guest I have seen as I don't want them to feel awkward. I see guests at the movies, stores etc..

Once, at a Kane County Cougars game.....  I spent the rest of the game hoping she would order a corn dog.
Also, once as I was walking through a hotel lobby I saw a provider checking in.  
Both times I noticed them, but they didn't see me.  If they had noticed me, I would remind myself that DISCRETION IS KING, smiled, and not said a word.

Speaking of discretion......  I've seen two situations recently that made me roll my eyes.  First, there was a nervous looking dude with a bouquet of flowers waiting in the hotel lobby. Secondly, I saw a guy in a hotel lobby bathroom brushing his teeth.  C'mon knuckleheads.....be discrete and don't ruin it for the rest of us!

Kind of rude if were both alone and she doesn't acknowledge me at all, other than a glance.

I posted about it on the GD board, similar topic.  I happened to be on the same early morning flight as a provider I've seen several times and really enjoy.  We smiled at each other while waiting to board but that was it.  As luck had it, full flight and they gate checked my bag so I ended up in baggage claim with her, where I would normally never be, and then we chatted while waiting for our bags.  By this time I had already contacted her agency and made an appointment for that night, but she didn't know it yet and I didn't say anything...in fact at no point did our conversation go anywhere near the hobby...that would have been a major faux pas.  She was unfamiliar with the city so we rode the train in together, and fortunately she was an easy walk from a station on the same line two stops before mine.  She said goodbye, good to see you, etc, and went to get off and I said "see ya later."  An innocent comment but I'm fact I did, which resulted in a good laugh and an awesome time when I showed up at her door that evening.

Only time that's happened to me, and I'd also note that I would never have approached her if her body language hadn't indicated it was OK.  Both parties need to pay attention to that before even offering a "hello;" like it or not it's a sensitive area

Saw one of the local ladies at a restaurant talking with a gentleman. It wasn't acknowledged at all until later in an email.  

My rule is to not say a thing.

and one of them I never saw the guy again and he had been a regular I saw at least once a month.  Late night I looked a wreck and we made eye contact and walked away from each other.

Another was out and about, we smiled and passed.

I also have had family members of my friends who were male come up and talk to me where I couldn't place them and thought they were a guest taking a few mins to place, that one always freaks me out being all nonchalant...  Till I figure it out

I was biking along the lakefront and saw a provider I had seen before.  She was getting a run in and was headed in the opposite direction.  She didnt see me, but she is/was a favorite of mine and so I couldn't miss her.  She looked so good...I nearly fell off my bike trying to get a better look at her!

someone I met at a Meet and Greet, she was at a restaurant with another woman and I was with friends.   Nothing was said, but there was the casual look like I have seen you before.    

Another restaurant different provider, never saw met her in person but seen her postings and website.  I d o have to say, she looked more amazing in real life than her pictures.

Last, but not least - while I was shopping.  She smiled at me and we exchanged a few kind words, but followed up with an emails later.

I have crossed paths with a few other providers, but nothing was said

Yep, It Has

I noticed someone out in public and he noticed me, however we just kept walking as if we never knew each  other.  But sure enough later on that day I had a email saying hi I saw you.  

 
AJ

I've had some friends worry about this. Us ladies do have lives outside this industry. Some of us do date. And some of us date guys who are older, bigger, smaller, etc.

 
I know there are lots of guys who like to think every pretty girl is a hooker, and every guy a hooker hangs with is dishing out money. A lot of times she's paying her own way in the real life relationships.

I saw a women in the NW burbs about 10 years ago. About 3 years later I bump into her at my kids school.  I don't think she remembered me but I sure remembered her.  Wow that was scary.

It did happen to me once. If I would have been alone I would have been able to handle it better.
I just felt very nervous and worried as I was with a group of friends.  
I think I mentioned something about meeting each other  at the health club and she followed the lead.