For primary dates and times:
Official GOP websites for states.
For delegate allocation:
The Green Papers
Frontloading Blogspot
For polling data:
Real Clear Politics
A few clarifications.
American Samoa will likely be unbound.
In 2012, they held the convention at a restaurant. 70 people voted. They just released who the delegates were and who their soft support was for, not the vote tallies.
Utah will likely be WTA if Cruz gets to 50% or proportional either to the top 15% candidates (if all three candidates get > 15% of vote) or all the candidates, if either Trump, Kasich or Cruz fall below 15%. In the later scenario, a candidate like Rubio could technically get a delegate.
In most likelihood, the delegate apportionment will be the same under either scenario, which allows for candidates to get extra delegates due to rounding (e.g. 1.1 = 2 delegates).
Also, you can caucus via Internet in Utah. Internet voting ends at 11 pm MDT, which is approximately two hours after the caucuses are finished. It is unclear if we will have to wait until 1 am EDT to begin to get results, or if they will release data after the caucuses close at approximately 9 pm MDT (11 pm EDT).
Arizona is straightforward. Winner takes all.
Info on the American Samoa territorial convention.
It will apparently be held at the Veterans Memorial Center building. It starts at 4:30 pm local time (11:30 PM Eastern) and should end at around 6:30 local time (or 1:30 EDT).
Delegates will be unbound, although, they may declare their soft intention on whom they are potentially voting for.
http://samoanews.com/content/en/local-republican-party-caucus-today