So after months of going back and forth on what to do for favors or whether we should do them at all because most people don't care about them, we decided on Uber passes and I just wanted to share a little about it for anyone who might want to do it too. Basically you upload your guests emails (I chose one email for each couple or family I knew was coming together) and set a price limit per ride (as low as $5), and whether you're giving them one ride or round trip, and then a date and time window where the pass is good. You pay a service fee (mine was $12.50) and you're done! They set a max amount you'll be charged, email everyone their pass, and you only get charged for passes people use, 3-5 days after the event. We're doing an open bar so I'm glad no one has to worry about getting home safely.