I started doing the same for my grand daughter's ES for about four years now. I take whichever scope I may find convenient for the planned observation. I always hold these outreach events on the Friday following the new moon. The reason picking Friday following new moon is because we always get crescent moon to observe. I always send a Bcc. email to the group announcing the event with brief detail on the planned observation targets (always moon plus planets as available for the night, etc.). This way I ask parents to prepare their kids on what to expect.
Initially I was using my 8 inch Dob but I realized that kids disturb the pointing. After that I started using my GP mount with C8. I do rough polar pointing, basically pointing the mount roughly to North and set the latitude on the Lat scale. It has worked. I use my TeleVue 8-24 zoom EP. It allows use of zoom level to suit the object - i.e., low for moon and highest magnification for planets like Jupiter or Saturn.
Never had any issues. I have had a minimum crowd size of about 40 and maximum of close to 175. I always kept a second scope - my iOptron Smart Cube with 80f5 handy and it is quickly deployed if the crowd size is large. Long queue is not a good thing for outreach. Kids can lose interest quickly
The EP is placed at a place roughly like 40 to 45 inches from ground. I take a small step ladder (a ladder with three steps) along. It can be placed such that kids can use one of the steps to stand on. I always remove the finder scope because kids try to peek through it or grab it for support.