<human>: Here's the situation:

I'm 21, live in a small Canadian town and work as a bartender / server at one if the more high end hotels in town. I've been at my job about 5 months now and get along well with all the staff in various departments. 

One did the younger guys in sales (there's a number of younger guys in different departments that all get along) asked if I would be available to bartend a private party for his friend at another hotel pent suite in town. I could bring a friend, payment would be tips plus free booze, casual. 

I agreed without really thinking much of it, unfortunately. He said he had a couple people to do it but they ended up not being available. He gave me his info, and that was that. 

Fast forward to tonight at work, the guy who contacted me was playing live music in the bar / restaurant, with his wife joining him for a couple songs, leaving early, and it's my job to serve him and the others playing 4 free beer each throughout the night. By the end of the night, in getting a bit of a creepy vibe from these guts and realizing a little too late that bar rending their private party tomorrow might be a little weird. It was mainly the little comments he made like "ya in sure the wife will leave early agin tomorrow and we will party" and "it'll be really casual, just get yourself looking good like you do and help open and serve the beer". 

Am I nervous for no reason? Or am I right to have my concerns even if they are a bit late.  

Sorry if the formatting is off- on my phone but will edit in am.

Summarize the given text in a few sentences.
<bot>: I agreed to help bartend a co-workers event (hospitality industry) and now I'm nervous I've put myself in a bad position