Is there any usual/best practice to fetch historical fomc meetings events online?
You can find information about the meetings online here: http://www.federalreserve.gov/monetarypolicy/fomccalendars.htm
As an example the following paper backtests certain effects supposedly connected with these meetings and whether they might be exploited:
The Pre-FOMC Announcement Drift
by David O. Lucca (Federal Reserve Banks - Federal Reserve Bank of New York) and Emanuel Moench (Deutsche Bundesbank), Journal of Finance, Forthcoming FRB of New York Staff Report No. 512, July 26, 2013
We document large average excess returns on U.S. equities in anticipation of monetary policy decisions made at scheduled meetings of the Federal Open Market Committee (FOMC) in the past few decades. These pre-FOMC returns have increased over time and account for sizable fractions of total annual realized stock returns. While other major international equity indices experienced similar pre-FOMC returns, we find no such effect in U.S. Treasury securities and money market futures. Other major U.S. macroeconomic news announcements also do not give rise to pre-announcement excess equity returns. Pre-FOMC returns are higher in periods when the slope of the Treasury yield curve is low, implied equity market volatility is high, and when past pre-FOMC returns have been high. We discuss challenges at explaining these returns with standard asset pricing theory.
The following chart is taken from the paper:
The Fed website has all this information. The period 2010 to 2016 is very conveniently laid out here http://www.federalreserve.gov/monetarypolicy/fomccalendars.htm [as already noted by vonjd], and meetings from earlier years can be looked up more laboriously here http://www.federalreserve.gov/monetarypolicy/fomc_historical.htm .
I made my own spreadsheet and I just update it once a year when the Fed posts new information.