I've always been a fan of giant pitchers of mojito and sangria. Easy to make simple versions, with plenty of room for creative improvements. I usually made double virgin batches, then split them into singles and added booze to one of them.
For mojito pitchers, I recommend muddling only the lime as your first step. Don't muddle the mint in a pitcher, you'll bruise it too much and release too much chlorophyll and make it bitter. Take a bushel of mint, give it a good slap to release the peppermint oil, then toss it in with the ice and sugar, then stir/shake it until the sugar is dissolved. The ice will do the rest of the muddling for you in the pitcher.
For sangria, go fuckin nuts. You can mix all kinds of fruits with all kinds of wine/booze. If I wanted something tart, I'd do dry red wine with a bunch of tart fruit like cranberries and cherries. If I wanted sweeter, I would do berries and stone fruits with a sweeter white. I always add oranges and maybe lemons/limes to ensure there's a decent acid base to contrast the other flavors. If you want a stronger sangria, you can fortify it with a triple sec, schnapps, or a straight up hard liquor (I toss rum in mine, because fuck y'all it's a party).
These are just easy, high volume ideas that take little effort. If you want more ideas, let me know what specifics you're looking for and I'll give more advice. I've managed beverage programs in the hospitality industry for a few decades. I can help you make anything to taste like anything.