For those arriving from the USA here are a few tips regarding crossing the US/Canadian border. A more complete document is available from AOPA titled:
 "The AOPA/COPA Guide to Cross Border Operations (United States/Canada)"

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The "Visitors to Canada"  document (right) has been edited to highlight (in green)and deemphasise (in grey) areas of varying significance to those attending the Georgian Gaggle by SeaRey.

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Aircraft entering (and leaving) Canada must first submit an eAPIS notice via the internet.  The detailed online form provides the CBP with details concerning aircraft, trip, crossing point, pilot and passengers. The CBP will issue a permission to travel (or denial) via email.  You need to register for the program at: https://eapis.cbp.dhs.gov/ and it may take five days for approval. Use the above link also for eAPIS departure and arrival notices.

You must next file and activate a transborder flight plan,  have an operating transponder and contact a US ATC agency prior to crossing the border.

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Operators of SeaReys in Canada must carry proof of at least $100,000 public liability insurance.

The aircraft must also carry its registration certificate, C of A, operating limitations and weight and balance information. You will also require your Airman and Medical certificates.

When operating in the USA an American flying a US registered aircraft does not require a personal Restricted Radiotelephone Operators Permit and does not require a Radio Station Licence for the aircraft.  However, the US FCC does require both if the aircraft is flown outside of US airspace! Therefore while Canadian law does not require them, technically the aircraft and pilot could be checked for compliance when they return to the US! Anyway, to my knowledge none of this (including insurance) has ever been an issue on four previous Gaggles.

To reenter the US you will be required to carry a US Passport..

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In Canada while enroute in uncontrolled airspace or VFR on an airway pilots should continuously monitor 126.7 as a listening watch or for position reports, sig weather, NOTAMS and other intentions. Most Flight Service Stations (FSS) monitor this frequency.
Canadian Flight Information Centres (FIC) for flight planning, NOTAM and weather services (similar to the US FSS system) can be reached on  126.7  (or as listed in the Canadian Flight Supplement) or by telephone at: 866-WX-BRIEF. Flights in Canada of more than 25 nm miles from the departure airport require a filed flight plan or flight itinerary. (A flight itinerary may be filed with a responsible person.)

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Scroll to the bottom of the "Visitors to Canada" document and you'll find a Standardized Validation letter authorizing  you to operate your Experimental SeaRey in Canada. Print and carry this authorization in your aircraft. (There is a similar FAA letter for Canadians entering the US with their amateur-built aircraft.)