Montizuma is day 3 of the event and is outside keystone ski area. Just take Montezuma road from keystone to Montizuma.
Loveland is a lot of fun, I know that mountain well (worked there for a decade). I recommend lifts 4, 8 and 9. Lots of good steep snow to be had. The steeps off of old chair 1 (chets dream) used to be great but the switch to a high speed quad means the snow gets really beat up. They have a (ridge cat) that takes customers cat skiing the continental divide for no extra charge. Or al least it used to be no extra. You just have to sign a waiver at the ticket office. Have fun skiing in Colorado and hopefully see you at the Jamboree.
Oh also check and see if (tunnel face) is open. It has a little gate between 4 and 8. Used to be a federal closure but now open sometimes. Amazing snow, pitch and you get to see some cool stuff.