Have a look at this:
The amount of money that each dependant must show is as follows:
If you will study in Inner London, £600 for each month of your course, up to a maximum of 9 months (i.e. a maximum figure of £5,400). The London boroughs that make up "Inner London" are listed in Appendix C, paragraph 12 of the Immigration Rules [
www.ukba.homeoffice.gov.uk/policyandlaw ... appendixc/]
If you will study somewhere other than inner London, £450 for each month of your course, up to a maximum of 9 months (i.e. a maximum figure of £4,050).
These are the figures that apply in most cases. However, if you have student-related immigration permission, which has not expired and
are applying for immigration permission to continue to study a course of which you have completed six months OR
have completed a course of study in the UK and that course was six months or more in length within your most recent period of immigration permission the amount of money that each dependant has to show is reduced, to £1,200, if you will study in inner London or £900 if you will study somewhere other than inner London.
authorising leave during term time is under the discretion of the school but from my experience ''going to a wedding'' doesn't normally fall under the special circumstances category so it is very likely it will be denied.