Boston: October brings fall foliage, the Head Of The Charles Regatta (late October), Boston Film Festival, MLB postseason buzz, and Halloween events, which can increase hotel demand near Logan International Airport (BOS). Delhi: October often features Navratri, Durga Puja, and Dussehra celebrations; these cultural festivals draw domestic travel and can raise hotel rates and domestic airfares around Indira Gandhi International Airport (DEL). If you plan to attend festivals in Delhi, book flights and hotels early; if you prefer quieter travel, avoid festival dates or choose weekday itineraries to reduce crowds. CTA: Check event calendars for both Boston and New Delhi before finalizing October travel plans to optimize price and experience.