I beg to differ, 5GHz band will propagate less as compared to 2.4GHz band; causing you less interference because signal from other people won't travel very far, not to mention the 2.4GHz band would be congested especially in a hall environment.
Since you'll only need wireless access in a single room, an 802.11ac based router+ap combo with the 2.4GHz band turned off will be ideal.
People buy tplink because it's cheap, and only because it's cheap. For light use, you can just go on carousell and get any 802.11ac based router+ap combo that fits your budget.