Or it can be very rewarding.
I like to look at it from the rewarding side of the coin, because my students and I have a discussion about how it's not "MY" room… but "OUR" room.
Therefore, on Open House night, I really don't walk around my room and just talk to people… what I do instead is greet every person at the door, make them feel comfortable as they come in… tell something funny, and give them brief directions about signups, etc.
Then I let the students do most of the work showing off our classroom.
The more transparent you are with your classroom and how it's set up, the more success you will have in communicating to everyone that walks through that door what your core values are (whether its open house or not).
Our "Open House" officially lasts for one hour, but I stay until everyone has had a chance to talk.
It just so happens that I stayed for 2 hours tonight… and I didn't mind one bit.
Remember, this job is about making positive relationships (as most jobs are)… and the extra time that you put in goes a long way.
Your parents will certainly appreciate it… as you have a very important job of teaching their children.