Festive on Height is a run of buffet evenings at Skyline, the restaurant on the 11th floor of Avani+ Riverside Bangkok. It is not the hotel's rooftop: SIN Rooftop Bar sits higher up the same tower. Each night brings an international buffet, live cooking stations and uninterrupted views of the Chao Phraya River, from 6 PM to 10 PM.

Halloween buffet dishes at Skyline, Avani+ Riverside Bangkok: a mummy-wrapped pastry, a red spider cake and eyeball desserts — The HI ELEVEN Halloween Edition, 30 and 31 October.

The HI ELEVEN Halloween Edition on 30 and 31 October adds a Halloween touch for the kids. Christmas Eve and Christmas Day dinners on 24 and 25 December bring seasonal favourites and festive desserts. The HI ELEVEN Festive Edition follows on 26 December, and the HI ELEVEN New Year's Day Edition on 1 and 2 January adds live entertainment.

On the HI ELEVEN nights, adults pay ฿1,266 with soft drinks or ฿2,045 with alcoholic drinks, and children aged 5 to 11 pay ฿750. Christmas Eve and Christmas Day are ฿2,494 with soft drinks, ฿3,749 with alcoholic drinks and ฿1,155 for children. All prices are net. The hotel advertises a 20% early-bird rate for bookings made by 15 October for Halloween, and by 30 November for the December and January dates.