Alright I play Sax and Drum so I've been in quite a few bands over the years and have on occassion been asked to do something like what you're doing ( Go somewhere, play a few good songs, get paid, go home) From my experiance the formula that the audience feels the most is starting with a really epic song, in your case it sounds like that would be you're a Dragonforce song that shows people that you've got tallent and gets them hype. Next would be a slightly slower song, and since you said you wanted something people can dance to I would personally not do a heavy metal song but maybe a popular rock song like A7x or even better Hendrix ( All around the watch tower just kills the audience, every time), finish with something memorable, a song with a really caatchy powerful riff, such as master of puppets or something along those lines. Just helpin' out a fellow musician.