Personally, I'm coming off an eight week stint where I did just that via stops at festivals in Toronto, New York, Reykjavik, London, Vienna and Copenhagen. I never bothered coming home in between, figuring it wasn't worth the time or the carbon footprint. While that may sound a bit insane, it's definitely not something I alone have experienced. And there's certainly folks who will experience it for the first time soon enough.
So I figured why not offer up a brief, highly subjective list of tips I've learned over this and previous stints on the circuit that may or may not be somewhat useful to those of you that have a similar journeys on tap in the future.
1. Set realistic goals, and make a plan before the festival starts. A first glance at a festival catalogue can be daunting no matter your profession -- especially if you wait until the festival's already underway to finally look at it. So plan out your schedule as early as possible (programs are usually online weeks before the festival begins), but do so keeping in mind that you can't do it all. Any half-decent festival is going to offer enough programming to fill every waking moment of your day (and then some), but if you actually try and pull that off you're likely to feel overwhelmed and exhausted. You probably won't even remember half the films or panels or whatever else when the festival's all said and done anyway. So ask yourself: What do you absolutely have to see and do? Cross off films you'll have the opportunity to see at other festivals soon enough or panels that you know are going to offer discussions you've basically already heard in a different context ("how to get your film distributed," anyone?). It'll give you some breathing room to both enjoy yourself and more thoughtfully take in what you do end up seeing.
2. Don't go home in between festivals. Have a bunch of festivals to attend that are more or less in a row? Make it one big tour. Particularly if you're a North American heading to Europe or vice versa (fall offers long stretches of important film festivals on both continents). Even if there's a week or two in between festivals, going home during that time might not be as worth it as you'd think. By the time you settle in (and potentially adjust to a time zone change), it'll be time to head off again and you're unlikely to feel particularly refreshed. You'll also be making a much bigger carbon footprint than necessary. So instead, find somewhere convenient (and interesting and cheap) to kick around in between festivals, preferably somewhere where there's a friend or relative that can put you up. You can get caught up on work and sleep and you won't have to subject yourself to exhaustion of two long haul flights. This also brings up the idea of subletting your apartment while you're gone. That might seem extreme, but it could help offset your extracurricular travel costs and also rid you of any fear your apartment has burned down or been robbed while you were away.
3. Try not to spend any money on food or alcohol. I am not at all suggesting you don't eat or drink. I'm just saying that most festivals offer enough freebies in both regards that you shouldn't really have to spend too much money on either, especially if you're somewhere where the currency exchange isn't in your favor. So don't skip out on the festival's official social event calendar. Even if they simply offer hors d'oeuvres, one spring roll might not feel like a meal, but 10 or 15 certainly will. And if you are going to spend money on food: make it good for you. It's so easy in a foreign country to immediately divert to those familiar golden arches, but considering the aforementioned free food you've been eating is probably really not good for you, that's not the best idea. Google search or yelp a juice bar or health food store and even out your temporary lifestyle a bit.
4. Try NOT to drink too much free alcohol or eat too much free food. Unless you want to come back from a film festival having gained 15 pounds, restrain yourself from too many double digit spring roll intakes. And more importantly, double digit free glasses of wine. There's nothing worse than taking on a full day and night of film festivaling with an extreme hangover. Or wondering what exactly you said or did in front of a bunch of potentially influential people you barely know. So while the art of restraint can be challenging when there's no financial consequence, it is an art you must learn to master (at least most of the time, one night of letting loose at a festival is fair game -- it's just not the time and place for a bender).
5. Exercise. Aiding in avoiding the aforesaid potential to add a festival fifteen to your waistline is the addition of a mild exercise regimen to your festival schedule. It doesn't have to be much. Maybe half an hour in your hotel gym or a dozen pushups and situps in your room. Or better yet, a good old fashioned run (which isn't quite possible at say, Sundance, but with any reasonably weathered festival it's a fine idea). The added bonus of running in a city that's not home is can double as a sight-seeing tour. Take to Google maps and find an interesting route -- perhaps one involving a big local park -- and go to town (and screenshot that route so you don't end up having to turn on data if and when you get lost trying to find your way back). You'll feel refreshed and ready to take on another day at the festival. And you won't get fat.