Details

EventLabels->{event₁->lbl₁,event₂->lbl₂,…} specifies that event_i should have label lbl_i.
The lbl_i can be any strings, graphics, or other static or dynamic expressions.
Positioning and other effects in labels can be specified using Placed.
The following events can be used:
date associate label with a date

Examples

KagiChart with two dates labeled:

Wolfram Language code: KagiChart[{"IBM", {{2010, 1, 1}, {2010, 1, 15}}}, 0.01, EventLabels -> {{2010, 1, 5} -> "●", {2010, 1, 13} -> "■"}]

Use Placed to control the positioning of labels:

Wolfram Language code:

RenkoChart[{"IBM", {{2010, 1, 1}, {2010, 1, 15}}}, EventLabels -> {{2010, 1, 5} -> Placed["→", Before], {2010, 1, 13} -> Placed["↓", Above]}]

Label a trading chart with news:

Wolfram Language code:

TradingChart[{"BIDU", {{2010, 5, 1}, {2010, 5, 31}}}, EventLabels -> {{2010, 5, 11} -> Placed["10:1 stock split", Above]}]

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