Bad first date idea?

[highlife]

Is a halloween costume party a bad idea for a first date? My friend thinks its great but I completely disagree.

Relevant details:
- I will know 4-5 people at the party, my date will not know anyone.
- The potential date is a girl I just met and don't know much about.
- There is a good chance there will be alot of single girls my age at this party, might be better to go alone and take the date to a more traditional first date place.