Near holidays is a good point. Near Christmas, many people are looking for ways to make a hand-crafted gift.
Also, you might be surprised by how many guys like to make a piece of jewelry for their sweetie for Valentine's day. (The concept of a home party might not appeal to them ... you'd definitely want to come up with a name that caught their attention in a more positive way. Maybe some type of Workshop.)
Also - Memory Jewelry is currently a hot topic! With Mod-Podge or
Image Transfer Solution (depending on your method), and
picture frame charms you could help people create some pretty wonderful things for Graduation presents, Mother's day, or Grandmother's day. Memory jewelry is a little tougher for people to make without a little instruction (or a lot of trial and error) -- so although it would be more work than just helping people string or do head & eye pins, it could be very special.