"Please" or "kindly" is redundant here. It would be better to say "Please call" or "Kindly call". Don't use both in one sentence, for they are synonyms
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Please send the technical check list ,technical information(if have any) and seat plan to us on or before 10 Jul (Mon).
Secondly, please kindly call me in advance if you want to take the Kwai Tsing theatre sticker(Please also bring along with the printed admission ticket and poster for the final approval).
Thank you very much.