American Radio Relay League, ARRL, Field Day is the most popular on-the-air event held annually in the US and Canada. On the fourth weekend of June, more than 35,000 radio amateurs gather with their clubs, groups or simply with friends to operate from remote locations.
The Objective of Field Day is to work as many stations as possible on any and all amateur bands (excluding the 60, 30, 17, and 12-meter bands) and to learn to operate in abnormal situations in less than optimal conditions. Field Day is open to all amateurs in the areas covered by the ARRL/RAC Field Organizations and countries within IARU Region 2. DX stations residing in other regions may be contacted for credit, but are not eligible to submit entries.
Field Day is always the fourth full weekend of June, beginning at 1800 UTC Saturday and running through 2059 UTC Sunday. Field Day 2017 is June 24-25.
This is a free, national event sponsored by the ARRL. Several hundred clubs nationwide participate in this event, which serves as a practical application of emergency operations, a fun contest, and as a public service event for Amateur Radio. Sometimes served agencies, such as National Weather Service (SkyWarn), the American Red Cross, and others join in with displays, etc. For Amateur Radio operators, it is a fun get-together as well as an opportunity to polish communications skills vital in the event of an emergency.
Bring your family and bring your friends, learn about Amateur Radio and how we operate in emergencies.
The clubs on Oahu that will be holding field day events are listed below and according to their website they will be held jointly this year at the Kualoa Regional Park. :
-Emergency Amateur Radio Club, EARCH HI, http://www.earchi.org
-Koolau Amateur Radio Club, KARC, http://www.karc.net/
More information about field day can be found at the ARRL link below.