You can make your booking for the Boat Race at Parque D. Carlos I Lake, in Caldas da Rainha. This can be made until the 16th Sept, free of charge, and the teams should be 4-6 people. The contact is from the Hospital Museum: (+351) 262 830 330.
The Grand Regatta Day is 21st Sept and you can expect a sporty and very nice day.
There will also be food and drink bars. The party starts at 10 am ane the regatta at 4 pm.