Welcome to Rooms 1.8!
Please always update in a test environment and make sure both database update, functionality and theming updates work for you.
This represents a significant step from Rooms 1.7 especially in terms of how we handle the interaction with the calendar
1. Use the BAT API - 7.x-1.0
2. The latest version of FullCalendar - 2.6 and much better and performant usage of calendars
3. Improved handling of options
4. Direct support for weekly and monthly pricing through weekly / monthly discounts