Even if today’s objectively beautiful weather doesn’t stick around by the end of the week, D.C.’s cyclists will Spandex up and hit the bike lanes on Friday for another Bike to Work Day. Commuter Connections and the Washington Area Bicyclist Association, who are organizing the 19th annual event, are expecting more than 20,000 people to participate—more than any in the event’s history.

Here’s how it works: On Friday, there will be 115 pit stops set up throughout the region. They’ll be operating at various times throughout the day (some are for morning commutes, others are for evening rides, etc) and offering free food and drinks, games, and the like. Take a look at the map here, where you can learn about what each pit stop has on offer.

Register for free online (if you’re one of the first 20,000 in the books, you get a free t-shirt—and before you ask, it’s robin’s egg blue this year) and indicate your pit stop. You’ll also be entered in raffles for new bikes. Five are up for grabs.

If you prefer to bike in groups, Bike to Work Day also offers commuter convoys led by volunteer cyclists. The routes start in various parts of the region, and most terminate in downtown D.C. There’s no registration—you can just join when you see a pack of cyclists zoom by. Event organizers also recommend finding a ride buddy via the Washington Area Bike Forum.

Bike to Work Day, of course, is not to be confused with the DC Bike Ride, which is on Saturday. That ride, now in its fourth year, clears cars off of 20 miles of D.C. streets for a morning trek, along with a festival of workouts, live music, and food trucks. Unlike free Bike to Work Day, the DC Bike Ride will cost you: It’s $70 to register, and $82-$169 if you want to rent a bike and helmet. (There’s also a new scavenger hunt game you can play on the course for $10.)

And what if the rain returns this weekend, and our wettest year yet continues? The League of American Bicyclists has some wet-weather cycling tips, which mostly boil down to taking it slow.