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The pronunciation of any word in English (or any language at all) is not Universal.  This is because there are many different dialects of The English Language — both throughout America, and also world-wide.  The pronunciations that are presented on GiveMeSomeEnglish!!! are based-upon a combination of both “common usage”, and the most neutral accent used in The International Common Tongue — a.k.a. “American English”.
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Attended – For this word:  the “A” is pronounced as a u-schwa;  the “tt” combination is pronounced simply like the single letter “t” (this is one of two standard pronunciations of this letter combination in The Common Tongue);  the first “e” is short;  and since the root-word ends with the letter “d” – the “e” of the “-ed” ending is pronounced as an i-schwa;  and the final “d” is (often) stopped.

– /uh-TEHN-dih[d]/ – /ə(ʌ).ˈtɛn.də(ɪ)[d]/ – Notice also that the stress is on the second syllable –

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Learn More About The Word “Attended” On Wiktionary

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