The Arapahoe County Republicans web site has a link to find your Arapahoe County precinct number and a link to a list of meeting locations for the various precincts.
Check out the "Call to Caucus" link for information about the purposes--including electing precinct leader(s) as well as electing the representatives ("delegate", "alternate") from the precinct to the Arapahoe County Assembly. Besides the county assembly representation, delegates and alternates will also represent your precinct to the Colorado state assembly/convention, your U.S. congressional district meeting to elect candidates for congress, state board of education, and the national convention; the 18th Judicial District (covers Arapahoe, Douglas, Lincoln, Elbert counties).
Please read the various calls to the assemblies for full details of the purposes and elections involved.
Note that the state convention will be electing the candidate(s) for the U.S. Senate who will be on the primary ballot in June. Several candidates have already "petitioned on" via the secretary of state process. Watch for more info.
Caucus starts at 7:00 p.m. Tuesday, March 1, 2016. Check-in starts 6:00-6:30 p.m. usually.
Fees for delegates and alternates to attend the various assemblies must be paid at the caucus March 1.
No formal straw poll for president this year.
Colorado Secretary of State:
Federal Election Commission: