You can contact pretty much any escort you want and explain to them that you would like them to accompany you to a business event.  Pretty much any would be willing to do so.  And yes, you will pay their same hourly rate...for when you are seeing an escort, you are paying them for their time - not for sex.

And if you do contact someone, do not mention sex as that will pretty much immediately terminate your conversation.  Escorts do not sell sex, they sell their time.  

Good luck.

Here's a suggested introductory conversation.

"Hi, my name is [insert real name or "stage name"].  I haven't met you before.  I'm looking to book an appointment with you on [date and time].  It will be a 3 hour appointment.  My references are [name other providers you've seen or "verifications" you have].  Are you available for that appointment."

After she responds affirmatively. then say

"On our date, I'd like to pick you up at your incall location or meet you at the front door of the [name of event location].  We'll spend the 3 hours there entirely.  It's a social event and I'm looking for someone to accompany me."

That should make it clear that there will be no other activities involved.  Never say the word sex or mention intimacy or anything else or she will hang up.

There is no discount based on what you do with an escort.  It's always paying them for their time.  Even if it is a fun thing or experience for them, they get paid for their time.  Typically for an evening event with a "sophisticated provider" you're going to want to take to a company dinner, you're looking at least $800 for the evening but probably more.  If you just go with someone less expensive, then they're not going to be the kind of woman you'd be comfortable with.  The $100 per hour escort may not understand the discretion you're looking for.

I think once upon a time such old-fashioned agencies existed but now they definitely don't.

On a completely different note, depending on how old you are, you might just find (free) women through online dating and introduction sites.  Many are looking for "non-serious" activity partners, and would jump at the chance to attend nice dinners.  Many are psycho though, so you run a different kind of risk.  I'd stick with your idea of escorts.

I love dinner dates and movie dates and dressing like - well, duh like I am on a date. Laughter and flirting is fun as well)

XXX-Giselle

You would do better on date.com, match.com or even some of the sugar daddy sites. I would leave the agencies and indys alone. If you don't want intimate company, why search for a lady who doesn't excel at being a civilian date? Prediction: You'll be perceived as a time waster or a suspected LE.

Check out eventsescorts.  It's exactly what you are describing, apparently the only strictly non-sexual service.