NAIPC is coming up on March 24th (start time here). More information about the contest can be found on this page. More information on how to register can be found on this page. You can register in teams of up to 3. This contest will be on Kattis.
Several hours later, it will be available as an open cup round as the Grand Prix of America (start time here). Please only participate in one of them, and don't discuss problems here until after the open cup round has ended.
The deadline to register for the contest on Kattis is March 21st. You will need an ICPC account to register (you can see instructions in the link above on how to create one if needed).
You can see some past years' problems here: 2017, 2016
UPD 1: The deadline to register your team is soon.