Exploring the city/surrounding area is another factor, definitely. For example, I won't usually stay late on Sunday of Otakon to 'explore' in Baltimore (I'm from the Mid-Atlantic, and with family nearby there I get to go relatively often); but if I could swing a couple extra hours in NYC after NYCC, I'd be all for that.
Sleep is also a bonus factor. If you plan on doing things late at night on Saturday, make sure you're well-rested before you travel!
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- Rose Lalonde "Glow" Tier (Homestuck): 95% (Detailing) Otakon 2014
- Fancy Mewtwo Gijinka (Cowslip Gijinka): 3% (Planning) Otakon 2014
- Secret Cosplay (???): 1% (Planning) Katsucon 2015
- Magic Armor Link (LoZ: Twilight Princess): 15% (Patterning) MAGfest 2015