this sounds like a good one.
but if youre goin to be particular with acoustics for a large event, i think its goin to be pretty difficult. to get a better feel of the desired size, i think forecasting the number of particpants (both private and traders) should be considered. kasi baka mamaya mashado malaki yung venue tapos, iilan lang mag exhibit. as far as im aware, there are only a few companies involved in phils drum retail industry, so this is worth lookin into. thinking big and possible way around this is to not limit it to a percussion summit but to also involve other musical instruments. in addition, you may want to tap other industries that have similar or the same market as the music retail industry so they can join in rin.
off the top of my head, as a pilot event, i think one of the feasible ones are clean & covered basketball courts or gymnasiums. then organise the floor plan based on your forecasted number of private and trading participants.
here are some photos of drum shows i've been to that could inspire this meeting of minds.
ideally, trading particpants should be organised according to their designated stalls, use clean and professional stalls that are avail for rent (wag sana yung changge/make-shift types na may Coca-Cola or Royal True Orange painting na ginagamit tuwing college fair for kissing booths etc)
each private participant on the other hand could be allotted a certain amount of area without the need for stalls, magdala na lang sila ng presentable tables and chairs nila. tapos siguro may stage for masterclasses, performance etc.
overall logistics will definitely play an important role so how about sa fees? ano diskarte? for both private and trading exhibitors and the general public. and be mindful about this aspect.