symbolsForEvent (event) {
		let symbols = this.getCalendarPropertyAsArray(event.url, "symbol", this.config.defaultSymbol);

		if (event.recurringEvent === true && this.hasCalendarProperty(event.url, "recurringSymbol")) {
			symbols = this.mergeUnique(this.getCalendarPropertyAsArray(event.url, "recurringSymbol", this.config.defaultSymbol), symbols);
		}

		if (event.fullDayEvent === true && this.hasCalendarProperty(event.url, "fullDaySymbol")) {
			symbols = this.mergeUnique(this.getCalendarPropertyAsArray(event.url, "fullDaySymbol", this.config.defaultSymbol), symbols);
		}

		// If custom symbol is set, replace event symbol
		for (let ev of this.config.customEvents) {
			if (typeof ev.symbol !== "undefined" && ev.symbol !== "") {
				let needle = new RegExp(ev.keyword, "gi");
				if (needle.test(event.title)) {
					// Get the default prefix for this class name and add to the custom symbol provided
					const className = this.getCalendarProperty(event.url, "symbolClassName", this.config.defaultSymbolClassName);
					symbols[0] = className + ev.symbol;
					break;
				}
			}
		}

		return symbols;
	}
Retrieves the symbols for a specific event.
@param {object} event Event to look for.
@returns {string[]} The symbols