Sentence:  By one o'clock the place was choc-a-bloc. […] The restaurant was packed, and the promenade between the two main courts and the subsidiary courts was thronged with healthy-looking youngish people, drawn to the <WSD>Mecca</WSD> of tennis from all parts of the country. 
Meaning of the word marked with <WSD> tags:  Any place considered to be a very important place to visit by people with a particular interest.