The festival screen is where you pit your girls and their swimsuits against the AI and occasionally other players during PvP events.
DOAXVV: Festivals Guide
Yeah, there’s some PvP. It’s still Beach Volleyball themed.
The matches are ranked in difficulty, with the lowest being E (F is tutorial level and not a conventional difficulty level) and the highest difficulty on the Japanese version being SS+, only available during events. The higher the difficulty, the better the rewards you get. Rank B is usually where you’ll begin to struggle, with rank A matches being nearly impossible to clear without either a SSR swimsuit and/or a lot of time spent farming and upgrading your swimsuits.
REC
REC. is basically the next match in line for you, as well a rematch for the last game you played.

MAIN
MAIN is the ‘story’ campaign. Yeah, there’s one. It’s pretty decent, rivals Mass Effect 2 imho. You’ll want to finish this as soon as possible as it is pretty much the only consistent source of Owner XP.

DAILY
DAILY is a very misleading title. These matches serve to help you farm resources to improve your swimsuits by rewarding you with upgrade stones and Zack Dollars. You’ll be spending a lot of time here to improve your swimsuits once you reach License rank A.

The day of the week determines the kind of matches you get. For example, if you are trying to farm POW Stones, your best bet would be to wait until Monday for optimal results, or go for it on Thursday and Sunday at less optimal rates.
Note that while the girls will get xp for competing in these matches, they will not receive any Gravure Panel xp whatsoever from matches in this category. These matches exist solely to provide you with a metric ton of upgrade materials that you will need later on.
EVENT
EVENT is a tab reserved for the current ongoing event themed around a girl, Gacha or in-game event, usually a combination of all 3. Don’t worry – the longest this game has gone without an event is about 12 hours. Most events follow a ladder format, where you have to clear E rank first before you can proceed to D, so on and so forth. The higher you go, the better the rewards.

Almost every event has an associated ‘Trend’ swimsuit and accessories attached to them. Using a Trend Swimsuit for the event matches confers a massive boost to the girl’s stats, usually more than enough to clear the entire event ladder. Due to the nature of the game, it is damn near impossible to keep this page updated as it changes every 2 week on average. Once you clear the main campaign, this is where you’ll be focusing your efforts.
License Rank
Your license rank initially depends on your progress in the campaign. Once you clear the campaign, it will reflect on your daily performance in the Event matches. What this means is that you will need to play about a few hundred event matches a day to get to SSS+ rank, and maintain that pace daily to stay there. Needless to say, that is rather difficult and pointless. I was once ranked #7 in the DMM server, and this is literally the only time I’ve ever said it to anyone else. It’s not something I’d put in my resume, but any potential employers reading this are welcome to see it as an indicator of my perseverance.
Jokes aside, your Licence Rank past SS- serves no real purpose except in PvP events, which I will cover in detail later.
That reminds me – if you’ve just started, focus on clearing the campaign and unlocking more girls. Both will require you to get some SSRs, so good luck with that.