There are hundreds of hotels/motels/inns/suites in the general MM8 Event area. With attractions such as Disneyland, Knott's Berry Farm, the Anaheim Convention center &c. all within a 20-minute drive of MM8, you can imagine the number of options to stay. Use the lodging search engine of your choice and plug in the zipcode 92821.
Here's a quick link to Trivago's search for Brea, California.
If you are going to fly to Southern California, try and book a flight into Orange County (SNA), Ontario (ONT), or Long Beach (LGB) airports. They are often cheaper than LAX and are all closer to the event area.